given different settlement amounts???

on 9 february i tried calling the call centre on the 808 number to confirm a settlement balance as i know i was in arrears with my account and i wanted to pay the account as the contract expires 9 March. My number did for some reason no exist on the 808 number and i emailed to ask for the details. I was told by Sifiso Maoka via email that my outstanding balance is R2362.59 and will be billed with an extra R480.50 by 13 February. 12 February i paid this amount and promised to pay the R480.50 then will request to close the account. I forwarded the Proof of Payment the same day and was told my account is not with MTN but with DCCm which i called and they confirmed my file has been closed with them in 2015 already. Thats when i received another email on the 12th from Sylvester Lewis saying amount in total is R2843.09 required to close the contract. After numerous email complaints from many departments and not one giving me answers i get an email 16 Feb that the outstanding amount is now R3323.50!!. What are they trying here i paid them what they asked for within 5 working days then after payment i get mixed information thereafter. i am frustrated coz no1 can give me proper information!