Unbelievably pathetic behaviour and mal-administration

Took out a 24 month contract. Gave notice of cancellation 30 days before end of contract - was told not possible, gave notice again few days after end of contract - was confirmed that would no longer receive monthly bills. Have reference numbers for both calls. Billing continued, 2 months later I went into MTN stor - waited 45 minutes for service, was told that their systems cannot reference those ref numbers, but she would send email to cancellations with my refs. Have a copy of that email. Billing still continued, had to reverse with my bank - costs + charges.

Eventually billing came to an end. Pre-paod data + airtime app**** to the SIM now did not work, and was contacted by Norton Lambrianos attorneys saying my account is in arrears. I provided all info + refs + copy of email and asked them to take that back to MTN. Everything went quiet for about 3 months, then they started the whole process again. I also comlained here on Hello Peter and received a response from Willem Jnr Loots, re-assuring me that the amount would be written off and the account closed.

Well I then took it to legal help, they dealt with Norton Lambrianos attorneys, and eventually N+L attorneys agreed to close the case.

4 months later, now MTN are using VVM collection agents to harass me again, this time even phoning other family members of mine, - receiving phone calls on weekends even at night.

What is you response MTN? I am very close to taking counter legal action for harassment and wastage of my time, and cost on my part.