Poor service

September 2019 I took out a new contract from MTN for R 209.00 per month.From October 2019 onwards MTN started to deduct R 519.00 from my bank account. I queried the additional amount at end of October 2019 and they told me they would rectify the amount that they deducted. November 2019 they still deducted the R 519.00 amount. this time when I queried they told me that I migrated. I went to the MTN branch in Uitenhage where I app**** for my contract and all the documents showed that the monthly payment should be R 209.00 per month and that they have no documentation that that I app**** to be migrated. The branch then send the original documents to MTN head office. I contacted MTN again to find out if the problem has been resolved, only to find out that they will continue deducting the R 519.00 per month because somebody migrated on my contract and I must get an affidavit stating I did not migrate. I feel that they should give the migration documents that was completed or reverse me back to my original contract that I signed for R 209.00 per month and refund me my money instead of giving me the runaround.