MTN Terrible Administrative service

Both my husband and I entered into new MTN contracts on 15 August 2022 with instruction that both contracts be paid via debit order. Both contracts were deducted monthly via debit order until November 2022 when they stopped taking my husband's contract off via debit order. He has gone to the Summit Road (Rivonia, Johannesburg) offices on multiple occasions in an attempt to get this resolved, he has been to the MTN shop in Mall of Africa to no avail. His phone gets cut off each month for non-payment and we cannot get MTN to resolve this administrative issue. Can someone help please, I can't believe how hard it is to fix something this small. Help please.