False advertising and rude receptionist

There is currently a promotion of R1500 of a frame or inhancement. My medical aid cover for the frame so wanted to use the promotion towards my enhancement. But was told that it can not be done because it is for the frame. My chosen frame is within my medical aid limit which will be paid. The lady that assisted us was very rude and unhelpfull. She spoiled the rest our day and should either get training or not work with public. I still dont understand how this promotion works and dont seem to get any terms and conditions to read. I would realy like to speak to someone that can give clarity.