MTN BILLING - UPGRADE Incorrect billing USELESS service

I was sent many sms's in February that I have to upgrade my contract or it will be terminated. I called and did the upgrade with Viwe, we discussed that my new contract would be R289 per month. I paid the R289 and my service was suspended. When i called to find out why they said becasue I did an early upgrade I have to pay an additional R60 per month for my old handset. NOT ONCE DID THE CONSULTANT TELL ME THIS. If he had I would have waited the 4 months and then done my upgrade. I have called them at least 4 times, been passed onto many different people and none of them want to take responsibilty. I want the R60 removed fomr my billing or they can cme get the new handset and I'll wait for the new upgrade.