*****ed over by game twice in a week

last month i went to game to settle my account. I asked what the settlement amount is and she printed me a slip. the price was round about R1860. i gave her R1900 too settle the account, for some reason she paid R1800 1st then paid the R100. i asked why she is doing it that way and she didn't have a answer, she gave me the slip with no change and i asked her for my change, she looked dumb struck like she doesn't know what happening, she called the manager and then they had to reverse the on a different till, she gave my change then a slip showing i paid but no balances showing on the slip. i ask her for a slip with the balance showing i owe nothing and she says she cant provide me with it as i need to wait 3 days for it to reflect or wait for a statement. RIGHT!! now i got a sms saying payment was due on the 1st. i went to game in Promenade and was told they needed to call RCS to get the settlement amount, How am i suppose to know what games processes are. why didnt the cashier or the manager not know they needed to do this when settling an account. the answer i got was despicable. only credit and sales managers know about this not any other staff members working at Game.