Worst Service

I am receiving no customer service what so ever from Mtn. I upgraded with Nashua mobile and I went from an anytime 200 to a my choice 100. Mtn took over all the Nashua Mobile accounts. The people that helped me told me that I will be paying less and actually receive more airtime. I should be paying R369 pm and receive 100 minutes 100 sms's and 100 meg data, but now I am paying R469 and only get R200 airtime (88 minutes) and 25 sms's. I have been trying to sort this out for the last two week, but no success. I am really tired of this poor service.