MTN billing

Nothing irritates me like paying your debt and it's not acknowledged, worse part they give you a bad name to other lenders. I took a contract with MTN in 2023 and this year it was little bit challenging for me to make a regular monthly payment according to our contract, however I managed to pay R4770 in May and in June I paid R500 but they didn't acknowledge that I made those payments. I couldn't even call customer service as they have blocked the sim card, in fact there's no network appearing at all. I only hope that MTN do take serious to our reviews and get back to their clients. This is totally unacceptable, can this be looked to and be rectified in speed.