I WANT MY MONEY BACK

Just over a year ago I took out a promotional data contract (2gigs) top up for R99. After a few months I asked to include the 2gig night owl onto my contract which was the same price but this would be an open contract. I ran a bill of R2000 in 1 month and told them after paying my bill that I would prefer to go back to my original contract which would cut out after my 2gigs has expired. Vodacom had since increased there rates by R10 which I had no problem with I also didn't mind paying a migration fee if that's what it came to. However I now receive a bill of R349 which I queried and a supervisor promised to listen to the recording of my instructions and call me back. That didn't happen I am now told I can't change as it was a promotion deal. I don't see any contract on their plans for R349, the promotion is still running and I can't fathom why I am paying R349 for the exact same package I was on. I told them that my damn adsl is that price and how can they charge a customer R349 for 2gigs of data monthly. I am taking this to the ombudsman as these providers cheat us all the time.