It is possible that this is intended and that they will prompt you to enter a new password on login.
Ask yourself these questions:
Are you sure it was your password? Did they generate a password for you? Did they verify that you are the account owner by asking you to enter the "hotline-pin"?
Ask yourself these questions:
Are you sure it was your password? Did they generate a password for you? Did they verify that you are the account owner by asking you to enter the "hotline-pin"?