Incorrect Allocations, incorrect arrears, messing with my credit score #disgusted!

I am NOT impressed with damn Lewis Stores and their incompetence. I have 3 accounts with them, 2 which I manually pay diligently every month and one that goes off via debit order which was concluded in the branch mind you. It went off 3 times successfully now on the incorrect dates and NOT ON MY SALARY DATE AS I REQUESTED THEM TO DO!!.Secondly, said debit orders are now allocated to the wrong account putting that account into a credit and leaving the account where it should be allocated to in arrears. A transaction that was done at the Pritchard street branch via their head office in Cape Town so please what *********, unprofessional service is this???? I am highly upset in that I am trying to purchase a product but found to my shock that I'm in arrears with Lewis while these people even deducted the June debit order way before my pay date and it went off successfully as I have funds in my account. And even though I have enough funds they are inconveniencing me because they are not deducting on the date that I expressly told them to and which is in black and white on the contract. They did the same nonsense last year where they would send a statement with the full amount owing, I would then pay that full amount as per their statement but once again they would allocate it to one account and not to the two accounts that I pay manually. I called to raise this issue and was told someone will get back to me after 48 hours, REALLY????? they cannot sort out their mistakes there and then?? I really don't know why I keep giving my business to this store cos it's just headache upon headache. The only consolation is that the floor consultants are really very nice and helpful and will go the extra mile to assist where they can. That is the only place where Lewis can save face. Other than that I'm disgusted and I DEMAND that they sort out my account because I owe them nothing!! I'm so angry right now, I don't even want to entertain their calls. I will go to the ombudsman asap because this incorrect arrears amounts is messing up my credit score.