horrible customer service at Ackermans Centurion Mall - Manager Olivia

Am extremely angry with the poor service i received yesterday at ackermans centurion mall.last month i put on a lay-bye for my daughter s winter clothes.yesterday i paid it off as the supervisor handed me my clothes he then started counting them one by one which i didn't have a problem .he explained that his protecting me and their store incase one item is missing i totally understood.to my surprise my kids jacket was not registered on the receipt.then the gentlemen explained that the jacket is not scanned so its not paid for.I then asked him so what is the procedure if such incident happens .he said i will then have to pay the item ..i told him but thus not my fault and for my knowledge everything in the plastic and taking it home today as i paid it off now.he then called the manager who did not even show much sympathy to me .Her name is Olivia she was not even giving me 100% attention cause while taking to me he also attended one of the guys who seemed to be delivering something for the store .The lady just said unfortunately i have to pay the item as it was not scanned.these nothing she can do cause if am given the item it will have a negative impact on their stock balance.she didn't care whether am satisfied with what she was telling me she then turned and assisted the delivery guy.It was my 1st time i took the option to lay-bye with ackermans and the experience was horrible,my question is why when i lay-bye didn't they double check that everything is scanned but when i leave suddenly they have to check ,and why should it be that i have to suffer and pay money i didn't budget for while the mistake was done in the store.at other shops the price u see on the shelf is the price you pay .its not the costumers fault that the shop made the mistake,why is ackermans customer service so bad!!! i told the supervisor i ll call head-office but that didn't even bother him as well. my email is ********** cell ********** 163