Cell C incompetence

I have been a subscriber with Cell C for many years. My phone account has since inception been paid by debit order. In June and July 2021 for some reason these debit orders were not taken. My account went into arrears by R560.51. On querying this I was told that Cell C had stopped debiting credit cards. I then immediately made the required payment in 11 July 2021. My August invoice dated 4 August 2021 showed this payment as received 12 July 2021. 6 months later, on 17 February 2022 I received an email from Cell C stating “Your payment for R560.51 has not been received. Your Cell C Services will be disconnected with immediate effect if no payment is received.” On checking my invoices and bank account I could see that I had indeed paid this. Every invoice from August 2021 shows no arrears. I phoned Cell C customer services to ascertain what the problem was. I was told I was in arrears. I then obtained proof of payment from my bank and forwarded by email to Cell C on 18 February 2022 which showed that this payment had been received by them. On 23 February 2022 I received an email “Outstanding Account Warning Letter” in which it stated that should I fail to pay within 7 days my personal details, or the details of my surety, will be listed on the Credit Bureau (I would be blacklisted). It further goes to state that my account would be handed over to the Pre-Legal Department. Then the harassment started. On 24 February 2022 I started receiving daily phone calls from Cell C asking for immediate payment. I called them back and they then told me that they could see that I had indeed paid but this did not stop the harassing phone calls. After 2 calls on 28 February I asked to speak to a supervisor but was told this was not possible. I was told that a Mr Isaacs would call me back but to date nothing has happened. To date I have received 12 calls from Cell C. They tell me that they can see that I have paid 11 July 2021 and this payment would be allocated to my account by their account department by the week’s end. This has not stopped the calls. This is pure harassment and distressing to me and my family. It would seem that there is no way that you can speak to a supervisor or manager to get this sorted out. Cell C, your service and the way you treat your customers who have paid what they owe is threatening and bullying. Surely this could be sorted out when you first received my proof of payment from the bank and why did this come up 6 months after I had paid my account?