CHARGED FOR AMOUNT ALREADY PAID

End of April my MTN bill was not paid and my services were suspended. After the debit order went off at the end of May and my services were reconnected I assumed they got the money and everything was fine however end of June I get a statement that quotes an outstanding balance of 2 months. As soon as I got paid 25 June 2015 I paid the outstanding balance of R1358.80 which therefore should now have cleared my arrears and I expected my normal debit order of R684 to be taken 01 July 2015 however on 26 June and 28 June I received SMSes saying that an amount of R2042.80 would be deducted from my account. I quickly responded by REPEATEDLY calling 808 in the endeavor to get an email address to send my proof of payment to. Countless times I held the line without getting through or sometimes the call was just dropped whilst I was on hold. I decided to dial *162*pin# as advised by the electronic message whilst on hold to get my balance due. According to that the amount of R684 is my bal, which is correct however TODAY I was charged R2042.80 and now my cheque account is in arrears for an amount I already paid. My bank is going to now charge me for a returned debit order FOR AN AMOUNT I PAID!