diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
index 613a3d2..28263e8 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
@@ -111,7 +111,15 @@ void UserManagementService::updateUserDetails(const std::string& userID, const s
 	int index = usersMap.find(userID);
 	if (index == -1)
 	{
-		throw std::runtime_error("User does not exist!");
+		throw std::runtime_error("User does not exist!\n");
+	}
+	if (util::isEmailDuplicate(email, usersMap))
+	{
+		throw std::runtime_error("Email already exists!\n");
+	}
+	if (util::isPhoneDuplicate(phone, usersMap))
+	{
+		throw std::runtime_error("Phone number already exists!\n");
 	}
 	User* user = usersMap.getValueAt(index);
 	user->setEmail(email);
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Validator.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Validator.cpp
index cdba432..f56d660 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Validator.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Validator.cpp
@@ -108,6 +108,17 @@ bool util::isPasswordValid(const std::string& password)
     return hasUpper && hasLower && hasDigit && hasSpecial;
 }
 
+/*
+ * Function: isUsernameDuplicate
+ * Description: Checks if the given username already exists among active users.
+ * Parameters:
+ *     username - string containing the username to validate
+ *     usersMap - map of user objects keyed by identifier
+ * Returns:
+ *     bool - true if the username is already in use by an active user, false otherwise
+ * Notes:
+ *     - Only considers users with state util::State::ACTIVE
+ */
 bool util::isUsernameDuplicate(const std::string& username, const util::Map<std::string, User*>& usersMap)
 {
     int index = usersMap.findIf(
@@ -119,6 +130,17 @@ bool util::isUsernameDuplicate(const std::string& username, const util::Map<std:
     return index != -1;
 }
 
+/*
+ * Function: isPhoneDuplicate
+ * Description: Checks if the given phone number already exists among active users.
+ * Parameters:
+ *     phone - string containing the phone number to validate
+ *     usersMap - map of user objects keyed by identifier
+ * Returns:
+ *     bool - true if the phone number is already in use by an active user, false otherwise
+ * Notes:
+ *     - Only considers users with state util::State::ACTIVE
+ */
 bool util::isPhoneDuplicate(const std::string& phone, const util::Map<std::string, User*>& usersMap)
 {
     int index = usersMap.findIf(
@@ -130,6 +152,17 @@ bool util::isPhoneDuplicate(const std::string& phone, const util::Map<std::strin
     return index != -1;
 }
 
+/*
+ * Function: isEmailDuplicate
+ * Description: Checks if the given email address already exists among active users.
+ * Parameters:
+ *     email - string containing the email address to validate
+ *     usersMap - map of user objects keyed by identifier
+ * Returns:
+ *     bool - true if the email address is already in use by an active user, false otherwise
+ * Notes:
+ *     - Only considers users with state util::State::ACTIVE
+ */
 bool util::isEmailDuplicate(const std::string& email, const util::Map<std::string, User*>& usersMap)
 {
     int index = usersMap.findIf(
@@ -139,4 +172,4 @@ bool util::isEmailDuplicate(const std::string& email, const util::Map<std::strin
         }
     );
     return index != -1;
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
index c8d334d..efb8d1c 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
@@ -143,12 +143,14 @@ Return type: void
 void CustomerMenu::updateDetails()
 {
 	std::string email, phone;
+    util::Map<std::string, const User*> userList = m_controller.getUsers();
 	util::clear();
+    std::cout << "Update Details\n";
 	std::cout << "Enter new email: ";
 	util::read(email);
 	if (!util::isEmailValid(email))
 	{
-		std::cout << "Error: Email is invalid!";
+		std::cout << "Error: Email is invalid!\n";
 		util::pressEnter();
 		return;
 	}
@@ -156,12 +158,12 @@ void CustomerMenu::updateDetails()
 	util::read(phone);
 	if (!util::isPhoneNumberValid(phone))
 	{
-		std::cout << "Error: Phone number is invalid!";
+		std::cout << "Error: Phone number is invalid!\n";
 		util::pressEnter();
 		return;
 	}
 	m_controller.updateUserDetails(email, phone);
-	std::cout << "Profile details updated successfully";
+	std::cout << "Profile details updated successfully\n";
 	util::pressEnter();
 }