You should discuss the situation with your broker. You can file a complaint with GLVAR or the real estate division if you think you were intentionally lied to in order to collect additional application fees. How much was the application fee? Was a copy of the the credit report provided to your client? Your client may have a reasonable argument to have the app fee refunded.
The Duties Owes requires a Nevada licensee shall: "Not deal with any party to a real estate transaction in a manner which is deceitful, fraudulent or dishonest". If this agent/property manager violated this duty, you owe it to yourself, your client, and our industry to make your complaint in the proper forum where the outcome can improve this business for everybody.
If you need any help finding the forms or procedures for filing a formal complaint, contact me through my profile and I'll be happy to help.