6 months and still no resolution or contact

App**** for an upgrade to a Wi-Fi contract in March. Goods received and all was in order, until MTN billed me +/-R3500. In June a refund was processed, payout received and the Complaints Analyst (Willem Jnr Loots) "compensated" me for time and inconvenience with 3 months free and 10GB of data. As far as I understood this meant no payment due for August till October, however I was billed end of August and the 10GB was charged to my account. Therefore, none of the "compensation" which was suppose to be free was free. I have been emailing and trying to call Willem, and no response. Since the start of my complaint in March, no one, not a single soul from MTN ever called me. I have on numerous occasions requested Willem call me back, no response. Last week I logged a complaint on MTN's website, received an automated response that my complaint has been received and it will take working days to be resolved. The 5 days have lapsed and no call, no email, absolutely no service from MTN. This is absolutely ridiculous and has left me speechless.