Please assist debit order was taken incorrectly.

I infirmed ADT that they should not debit any further from my FNB account , they called today and acknowledged its their mistake that they debited as we provided a new account to them. They still went against my instructions to debit which caused a RD on my account, they ADT will pay all cost incurred by me and give me apology letter , I need FNB to remove the Return Debit (RD) with Immediate Effect, we can supply the letter of error from ADT.<br> Please contact me on cell *** Clement Billings