Capitec making life difficult!!!

I have changed the account which my salary will be deposited into and called you guys to advise of this change and request that I am debited from there going forward. I am told by one of your agents that this won't be possible as there hasn't been a salary drop and that I should allow the debit to to fail on my old account and then only have my account details updated afterwards.

My issue is that I will be charged a few hundreds for the failed debits by my bank, have my credit score affected negatively and then be charged unsuccessful debit order fees by Capitec. I find this ridiculous as I am doing the right thing and trying to ensure that you guys receive your funds as per agreement but you guys are not coming to the party and are instead wanting me to pay fees and penalties and have my score affected negatively.