R1800 airtime cannot buy bundle I want

Hi,at the moment I'm another unhappy Cell C customer and would like to change that! I have a Cell C prepaid sim, On Sunday I bought R1800 worth of airtime to purchase the Giga 200(50GB + 150GB) data promo at R1799. When I tried to convert the airtime to data the option was not available! I phoned the customer care a few times and they could not help me and told me I need a specific simcard for this bundle and that I must go to the store(don't know why Cell C does not mention this on the website where they advertise this) So on Monday my brother went to the store to change my sim into a Giga 200 data sim for me as I work late and cannot catch the store open. They told him it cant be done and they cant help him????? NOTHING cant be done. Its my R1800 why not give me what I bought? its still your product? Then I phoned Cell C tech support on Monday also again got referred t different people no1 could help me? Eventually someone registered the problem and said they will get back to me in 24-48 hours, its been longer now. I also sent the Cell C representative on Mybroadband and he responded that someone will contact me...NOTHING! Please assist ASAP or refund my Money.