Terrible service from MTN

I cancelled my contract with MTN a while back. Someone **********ly made an upgrade on my contract and I was shocked to be debited an large amount in December 2017. I queried the matter and sent an affidavit (as requested) and the matter was resolved...or so I thought.

In March 2018 I received a call from Hammond Pole attorney saying they have been appointed to collect debt from me. I then sent proof in a form of the affidavit mentioned above and e-mails, and the matter was resolved...or so I thought.

Last week I received another call, yet from other debt collectors claiming that they have been appointed by MTN to collect debt from me (An exorbitant amount)!

I am frustrated because according to me, my contract with MTN has been cancelled a while back. The ********** upgrade issue was to my knowledge resolved.

No one answers the phone when you phone the customer care line. I have sent numerous e-mails looking for answers and to date, I have not had a response. I sent another e-mail on Friday, 19 October 2018 and no one bothers to phone me back.

What is my recourse? Why should I suffer for their bad administrative processes as a result? Who do I run to for help?

I don't even use the tablet with the MTN number (It has been over a year now)!

Frustrated Thando