Service suspension after payment

In August 2015 my debit order for my cell phone contract did not go through. I received an sms on 11 Aug, stating that i should pay R483.22 or my service will be suspended. I paid the money on the same day. Two days later my phone stopped working. I cannot receive or make any calls or use my data,etc. Two days later I received an sms stating that my service would be reactivated in 2 to 24 hours. Three days later I still had no service. I went to MTN in Centurion mall. After waiting for 30min I spoke to a lady who was very rude to me and refused to help me without a proof of payment (after i had emailed the document a week ago). I refused to leave before being helped. She then phoned the MTN customer care centre? and gave me the phone? I spoke to a lady who switched on my service. And now about a week ago I received the same sms stating that I still need to make the payment for the same amount and that my service will be suspended. Since then I have spoken to 2 call centre agents stating that the amount is not reflecting. I have resent the proof of payment last week. A debit order of over R900 went off of my bank account yesterday. No one has contacted me.