MTN: WHAT A JOKE!!!

What must I do, do get customer service from MTN? I cancelled my contract on 06/09/2022. I followed the procedures. I sent proof of payment. Now MTN is STILL sending me invoices. The payments WERE NOT allocated to cancellation of my contract. Emailing, or phoning MTN is pointless. There’s simply no customer service from them. It really is worse than any experience I’ve ever had from any government insitution. In fact, I thank and take my hat off for tge government officials I dealt with. Their service is way better than MTN. Should I contact the CEO, Mr. Ralph Mopita himself? If I have to, I will. I’ll get him to phone customer service from my phone, so he can experience it himself. Maybe THEN I will get service from you. In the meantime, I will contact some newspapers, ICASA, and social media. I am certainly not the only person experiening this.