MARSHALL SECURITY, REALLY BAD SERVICE FROM ACCOUNTS TEAM!!!

I called Marshall Security and asked to speak to Accounts department. Spoke to Genevive Padayachee & Justin from Marshall on the 03 May 2018. Asked them to change my bank details for debit order to go off on the 25th of May on the New Bank Account. They asked for an Email with a letter from the bank confirming my details. I emailed it to them on the same day 03/05/2018 @ 08:37am. So when I went to take out a contract for a new phone thinking i can afford to pay R800 for a Samsung S8, I was told sorry declined. I demanded to know why, They said i have an unpaid DEBIT order to Marshall Security. All my life i never had any unpaid debit orders. I changed details with DSTV, MWEB, TELKOM, MIWAY, all went off my new account. Only MARSHALL came back unpaid, BECAUSE THEY DON'T KNOW WHAT THEY ARE DOING!!!! THIS IS GOING TO STAY ON MY RECORD AT THE BACK FOR 12 MONTHS MARSHALL. ARE YOU GOING TO GIVE ME A SAMSUNG S8 to fix up your mistake? VERY ANGRY!!!!!!!!!!! I did everything humanly possible to ensure that they debit my new account! What a waste of time! CALL ME, MARSHALL, I REALLY WANT TO GIVE YOU A PEACE OF MY MIND!!! CANCEL MY DEBIT ORDER IMMEDIATELY!!! MAYBE I SHOULD POST THIS ON SOCIAL MEDIA...