What happens when you click the 'Forgot password' button?
Does it ask you for the answers to the security questions that you originally set that allows a self-service reset?
I agree with the other statement here as well. Try and do a Password Reset, if that works then great! The last resort would be Factory Resetting your Device there. If it is similar to the systems I deal with on a day to day basis you may have to Factory Reset your Cameras as well depending on the system but at least you will have your Log In Credentials.