Being penalised

I made a purchase 22/12/2014 game cresta n also made a payment R500. In January i called 2 check my instalment was told its R309 fine, next thing i receive a call account in arrears ad a good payer i called call centre was told im in errears i nee. To pay R900 i ask y was tol no payment made in december i scaned the proof of payment n never receive feedback. I call again was told theyll check n come back to me. 14/01/15 receive an email of apology n my enquiry will be sent to the relevent department n they have receive pop. Jan 27 made a payment of R500. Now saturday 28/02/15 receive a call from Patience from collection who has a very bad attitude. I told where to get off went to Game no1 was there to assist atleast a very friendly consultant help to call call centre yet again my December payments its not reflecting im in arrears.Monday sent an email to game contct us believe me till today no respond. So dissapointing and really frastrating... my credit profile its being damage buy ppl who doesnt know how to do their jobs...sick for weeks