billed more than I signed for

I upgraded in oct 14 for a R189 package. Ever since oct 14 I've been billed R198. I've had endless problems with MTN with no help at all. I've been paying R200 since oct 14. But now I get notices that I need to pay in an amount which I will NOT! Correct my package as my day doesnt evolve around calling 808. I went into the store they logged req# *** I am still waiting on some1 to call me. I called 808 again and Carlen point blank told me MTN will not help and not correct this. So who must pay for the charges now seeing that MTN increased contracts by R10! Should I have been billed at my correct amount of R189 I would not be getting notices seeing I pay R200 every month. Correct my contract as I WILL NOT PAY ANY EXTRA! And if I am black listed for anything I will take this further. MTN has been the worst mistake of my life since day 1 I regret ever upgrading! I expect someone to call me. And train ur staff to treat customers better and to deal with problems faster. All I see on hello peter are complaints. I will not run up & down to stores and making phone calls for something that was MTN mess up. Sort my problem out as I keep getting emails for notices that im not happy about