Virgin Active Promises but cannot deliver!!!

On the 30th June 2015 I made a call to Virgin Active La lucia enquiring about joining Virgin Active after in August as I was due for a major on the 02nd of July. I was then advised that I will qualify for R850 cash back if I join in June. I then agreed. Since I wanted the special I then rushed to Virgin Active La Lucia same day. I registered, got my card luckily enough I swiped my card. <br> <br> End August beginning of September I went to the sales person to enquire about the R850 cash back. I spoke to Theresa who went through my account, counted the days and advised me that the monies should have been in my account on the 15th August, she then spoke to the Manager who advised her to call the head office.<br> I was told I would get the monies on the 15th Sep. 15 Sep there was nothing. I informed Theresa who was to investigate and come back to me. Today 30/10 I decided to do a follow up. I'm now being told my application was processed on the first so I do not qualify. Why are they singing a different tune now after 2 and half months? How did I get my Virgin Active card and managed to swipe if ever it was processed the following day. Who's fault is it? Why am I suffering for other's mistak