MTN pathetic customer service and harassment

MTN "One doesn't know what the other is going, pathetic customer service" I bought a 24 month data contract 8th May 2017, *** paid in full R 2136.00 to Absa *** Cancelled 3 months ahead of expiry, due to poor reception and none existent customer service, didn't ask for a refund. Now, MTN is harassing me, that they want money from me, I had about 60 calls from them, that I owe them money. I send numerous e-mails to MTN customer service and MTN Swellendam, that I paid upfront in full, the Vat increase shouldn't hv an effect either, as this product was paid in full before the increase came into effect. No feedback, but they keep calling, isn't that idiotic! They dont even can explain why I owe them money, no records of anything.

Never will I touch any product from MTN again, no wonder they are losing business cause their service is pathetic!