Bad service by MTN

I have been a client with MTN for the last 5 years and my way of paying has been debit order for the same amount of years i have been part of MTN. Made my upgrade last year and this month the most embarresing thing happened to me .My phone was disconnected and when i went into the MTN shop they're word was that i did not pay my account. My account have been paid by debit order for the last 15 years , what have changed. So to reconnect my phone i had to pay cash , just to get an sms the next morning from my bank that MTN made a debit order. I have now payed twice this month : cash and debit order still to have a phone with no minutes. what is happening to MTN.....getting COVID