CAPITEC WON'T CHANGE DEBIT ORDER DATE

I work for a private company and my contract states I get paid on month end and my salary slip also states the same. However my salary comes in around the 27th, 28th or 29th. So I advised capitec that I DO NOT get paid on the 25th and that they should move my debit orders to the last day of the month. My account have gone into arrears twice now since last month. I have called and I have even gone into the branch to change but to no avail. I even spoke to a lady name Nolundi from collection who asked for my bank statements to prove and I did provide her with it but she failed and told me there's nothing she can do and that my credit score will be affected but she can't do any about it. How can you tell that to your client? I am so frustrated. Is there anyone in Capitec who can help me? This issue is reflecting negatively on my credit record. I've never skipped a payment. All I requested was for the debit order to get changed to get deducted on the last day of the month but this seems like an endless battle and in the meantime I look like a bad payer. It's just Capitec that decides when it will deduct people's money and not actually listen. This shows lack of care for your clients.... I must say that I haven't had a good experience with Capitec at all :-(