false pretences, nuthing done about it

My name is JADE. I am 28yrs old and I have been with Vodacom for over 14 YEARS. I have always been loyal to them but after the disgusting treatment I have been handed of late I will never open another account with them or buy one of their products again. It started when I went in to renew my R200 contract where I could get data for R79 a Gb on top up. I was starting a new company and could pay a bit more on the contract but still keep costs down. So with every contract that niel showed me a asked specifically if I was able to get the R79 per GB. HE SAID YES. He even called anouther sales advisor and asked him and he even said YES you can. So I signed. Then a week later I get my first airtime. A top up 200 to find out that I now have to pay R150 FOR A 1GB DATA. DOUBLE of what I asked. I then returned to the shop and told them this is not what I asked for. they then proceeded to tell me i must take a separate modem and contract after I specifically told him five times what I wanted. I THEN told them I will never buy anouther contract from them again under their FALSE PRETENCES and left. 15-20 min later I get a phone call from a lady who says they will sort it out I'M STILL WAITING!!