Partner clients and app administrators not on the same page

After visiting Bhandaris in Fish Hoek for a meal. I decided to try the entertainer app and take advantage of a deal. Upon mentioning this to the waiter, she checked with the management and he decided to not give us our deal as "the system was not setup by them". I find this reason unlikely, as why is this restaurant listed on the app in the first place then if we as patrons cannot use the benefit. Needless to say, I follow up with the Entertainer who would follow up and get back to me, but to date not an email any response from them.