Frustrated and irritable

My contract ended with Mtn on the 13th of October, I never upgraded. I called them to cancel the contract, the oady I spoke with said she did, I got a confirmation email saying my numbers have been changed from contract to pay as u go (prepaid). And I have paid all the monies that was outstanding.

Then, Boom. A month later, I got an email saying they handed me over to their legal dept and they demanding payments from me, they even listed me as a slow pay on bureaus. Apparently I owe them, for what I don't know, Mtn have been a nightmare for year. I call the helpline, spoke with a rude service champion, she said my ID doesn't exist. I hung up, 5 min later, I called, they guy I spoke to said I'm owing for August an amount of R262. I went to their shop in menly park, they can't help me.

I paid the money, maar still I'm owing. What will it take for MTN to get off my back? Huh? I'm so frustrated and life has become unbearable. Please help Hello Peter