VERY unhappy customer

My contract was renewed in November last year and I took a 500MB bundle with it and paid R149 per month for it. I complained that I can buy 1gig for R149 so why is my contract so expensive. Vodacom refunded me and I asked for 500MB at R99 per month. Low and behold, I did not get this. I have been buying extra data bundles as vodacom decided to only give me 250MB data. I dont know where they got this instruction?? I also sent an email in Sept to take away my sms bundle...this has still not been done?????? Crazy... vodacom simply cannot follow instructions. What are you going to do about this to rectify and make me happy again????? I have been following up but nobody can resolve. Why do I always have to go to hello peter before I get results?