Milking ciow

I am an account holder of 4accounts with MTN I have been paying around R1570.00 or so but today my account has sky rocketted to R2300.00 Early in the month I was called and told that I was getting less airtime and data on my principal account and was promised more data and more airtime at no extra cost but guess what today I was surprised to get the account to be more by R500 I called the call center and I spoke to phumelele who told me I was charged a migration fee before I could ask her more our conversation was cut I called again and spoke to menzi who didn't want me to engage him in the discussion of finding out why I was over charged and instead he transferred me to Thobile Cele who explained that my account was more because I was charged a migration fee I told her I don't know anything about the migration fee because the person who called me said there were no extra cost and she gave me a reference number *** I told her I would not have agreed to be charged more than what I was paying and that the person who called me ******* me and mislead me I then told Thobile that MTN must immediately put me back on the contract that I had with them because we or rather I cannot accept being milked by MTN I would have asked the person who assisted me with the upgrade of ny other phone to put me on the contract that gives me more data but I was content with my contract until I was mislead by the person who called me this month I want MTN to return me to my original contract and refund me my money My MTN pin is 1964 And my name Daphne Tlhabela ***