MTN online upgrades disaster!!!!

Online upgrade was done on 21st of August.I was told I would have to a once off amount of R260 on the old device in September. I paid an amount of R360 bit MTN disconnected my phone end Sept and forced me to pay another +- R254. Now payment on the 2nd of November is R778 instead of R499. I have been trying to get hold on Upgrades for hours without success.I get on getting cut off. When send an email to Mtn I get an reply with a 32 digit reference number.Dialling 135 is absolute waste of time,you never get to the correct person. Going to a branch in the mall doesnt help either. You get told to contact Billing dept.it is a never ending circle. It feels like the agents are covering for poor service bt frustrating customers. They even dont follow up complaint on Hellopeter either. I have lost faith in MTN