Cell C - Contact me !

I have been a loyal customer with Cell C for over 10 years. I have never missed a payment. When I upgraded 2 lines with them in 2021 I opted for payment via debit order as I always do. A few months into the new contract I wasn't debited for 1 of the 2 lines, I contacted them and made payment. I then made sure they had the correct details and informed them that I wanted to pay by debit order. The following month I was debited correctly and then in the next month the line was again not debited for that line. I contacted them again and was correctly debited going forward. However I then noted they had put two unpaid months on my credit profile. I contacted them numerous times to have this rectified with no luck. I escalated this on social media and they requested my credit report to rectify this. I sent it and received no response. I tried many more times to no avail. I have phoned in and they request my report to rectify, however the email address I am provided returns undelivered. I am at a loss as how to rectify this and the affect on my credit score is at no fault of my own. They are quick to offer upgrades but no response to their error. Cell C please contact me.