Very poor service from MTN

I received a call from MTN on the 23/03/2020 to update me on something. It was just before the lockdown and because I am a small business owner I asked the lady what can I do if I don’t get any business in and can’t pay my account. She told me that I can arrange with MTN to move the payments. Being a loyal MTN customer of 6 years and never missing a payment I tried from the 08/04/2020 to arrange per telephone but the phone system was not working. Then I started logging numerous calls with no result or even any reply from MTN. On the 15th they debited my account which was sent back because of insufficient funds and impacting negatively on my credit score and bank charges. Logged numerous calls again with no response. On the 17th I received an SMS from MTN stating that they removed the debit order from my account and that I am on a cash payment basis. I still kept on logging calls to arrange with them with no response. Today I was buying food and my card was declined. On further investigation MTN debited my account after putting me on a cash payment basis that would have cancelled all debit orders. I am a very Unhappy customer. If I just left the situation and not try to arrange with MTN I would have understood what was happening. Covid 19 is affecting us all and this is the response from MTN.