Incorrect debit order date

Hi, My name is Sizeka Mafanya, i have a airtime contract with Mobile Plus (MTN) and the lady who opened the account had a wrong debit order date (31st of each month) and the agreement was for the 2nd of each month. I have been receiving sms's that my account was in arrears and when i called the call centre/customer service on 13 April 2015 i was told my account was in arrears about R78.00 today 23 April 2015 when i called them again as i have a problem with the airtime i topped up i was told my account has been in arrears for about 3months and they will be deactivating my number end of this month and in order to get my number i must pay R858 for full contract and R150 for sim swap and R117.00 in arrers. Am really not happy with this and i need this to be sorted. i request the telephone call when i opened this contract.