Call center agents can't take a simple request it over 3 months of dealing with same problem

I am really annoyed. Every single month the same story. How many times must I call MTN to change my debit order date? Every single month. This is very upsetting. I have asked your call center agents to change it BUT EVERY SINGLE MONTH I AM DEALING WITH THIS ISSUE... This is a simple request but the way this matter has been dragged I am even starting to question the level of understanding of your call center agents Can someone who can take a simple instruction call me so we can put this matter to bed. I am not calling those people again they are not well informed and cant do a simple instruction. Please make sure your staff is well equipped to deal with simple request like debit order change yerrr