Please allocate my payments so that this nightmare can end

I am a customer of MTN for a very long time. I Have 2 contacts with them .My bad experience started in February 2020 when they switched to a new system. They deducted my debit order on the wrong date ,and the debit order was rejected by my bank. I made a online payment on the 29 February to both my accounts and since then I am struggling to get the amounts allocated to my accounts. According to all the consultants I have spoken to since then the funds are reflecting on the old system. I do not know what the problem is that they cannot allocate it to my account. I have to call in almost every week for both lines to be activated. Debit orders are going through my account on dates that I did not agree to which cost me unnecessary bank fees. Proof of payments have been sent to them on many occasions. This Morning both my lines are suspended. I really do not now what to do anymore .