Horrible service

I’ve had a contract with MTN for 18 months. For the first 15 months my debit order went through as normal. All of the sudden the last 3 months they tell me my debit order is unsuccessful. I’ve contacted them every single time and NO one could assist me. This week I contact them again. The one consultant tells me the Debi check mandate needs to be approved. It was approved when I initially took out the contract but anyway that’s besides the point. She asks me if she can resend the mandate. I make the manual payment and ask her to send the mandate. My email clearly went to the back of the queue and the person now assisting asks for a bank confirmation. Why? When I’ve had a contract with you for nearly 2 years and when YOU guys deleted the mandate. I’m not able to delete the mandate on my side so it was not my error to fix and the consult that asked me if they can resend the mandate should have asked me for the bank confirmation. Such disappointing service. No agent tried to help! Not a single one