Upgrade contract misleading customer. MTN lies

I did an upgrade 2015 September for an iphone6 through Summer Sun Mobile which is a MTN service provider.<br> My contract stipulated that it is R259 and receiving R200 airtime and 25 sms. Previous contract I used to receive data but to this one no data after mentioning to Summer Sun Mobile that I don't want any change to what my old contract was. I pay R127 and company pay R300, totalling to R427. After several contacts with MTN they cant tell me exactly why they charging me more than what contract says of R259. MTN keep on sending me back to Summer Sun mobile, saying they loaded wrong contract. its been 5 months now and MTN can not solve this problem yet they are still debiting money from me and receiving payment from my company.<br> One consulted **** in January saying the matter has been escalated to the Manager but until now no manager has called me. When I call 808 MTn contract number all consultants are useless and they tell me they cant see the R300 the company is paying. When I went to MTN store, they showed me the screen of how all these monies are going. After more than 15years with MTN, now they are ******** and *****. I want explanation why contract say this and MTN does othe