Pay for homechoice inadequacy

I ordered towels from homechoice,where they have send banking details to pay the money in,I paid the money in 2days after I paid the money in the call centre called me saying they out of stock,I said well I wanted and needed what I ordered,so pay my money back into my account.The call centre agent said ok,the next day I called because there was something else I was interested in but once there was no stock, only to find out the agent didn't logg the call as I asked, I then told the lady rather put the money into the account 19.10.15.She appologised and said she will logg the call and payments normally take 14days but shell push for 7days.Today 30.10.15 I received an sms money into my acount but not the amount I paid in,I called the call centre and was told fnb takes service fee,well it wasn't my fault homechoice didn't have stock so why must I pay service fees if they ddnt have stock, the principal of the story is that due to fact no stock my whole amount must be credited my deposit slip was emailed on 12 Oct...so they can see what amount was put in.I need my money to be rectified.