Mutichoice Poor Customer Service

Im october Dstv sent me an sms offering me the full premium package at on offer of R699. I duly signed up for it and as i have a PVR decoder it was an additional R90 which would make it R789. In october i paid an amount which was not R789..it was more. When i queried it a lady by the name of Ndileka assured me of their mistake and worked out what i should pay for November after she worked out the refund for October. She gave me an amount of R610 wch i paid. During November i was keep on geting sms's from dstv claiming i owe them R90 and that i would be cut off. I paid the R90 to avoid that. In december i was billed R899 again..once again an operator called Molivia assited me and promised to resolve the issue and that i would be kept informed of the process. Up till date i have no response at all. As we approach january my dstv shows my amount due is R899. This is very poor service from Multichoice. I have the sms that was sent to me offering me the special. How hard can it be to resolve? Im sure Dstv has records of all my conversations with them. Surely this cant be a trainsmash to resolve? I would love to get some feedback on this platform because unfortunately i cant seem to win via Multichoice.