Mtn bad service

My pay date changed since lockdown started and I’ve logged so many requests with Mtn to change my debit order date and up till today nobody made contact with me. My debit order keeps on going off on the 25th of each month after I’ve requested for it to change to the last day of the month. I am being charged by my bank due to insufficient funds. Really not impressed by the service. I understand that people are working from home and the service cannot be as fast as other times but my first request I logged was on the 15th April 2020 ( *** ) then another request on 28th May 2020. On the 7th June 2020 I received an email stating my request has been escalated to the support team ( REQ*** ) and yet my account was debited on the 25th June 2020 again and again I have to pay the bank charges. This isn’t fair Mtn