Wheres my free drink?

So much for the "buy 7 drinks get one free!" The "punch card" registered my first 6 drinks, and Ive technically purchased my 7th drink three times now, but it will not register, so I still dont have a free drink on my app yet. Ive sent two complaints through the app so far. Please fix this!!!

SlurpeeLuvr about 7-Eleven: Rewards & Shopping, v2.0.2