Coricraft account - payment made but not allocated

Bought Corricraft Unit - was told about 6 months interest free option - very reluctant, but went for it.<br> Contract states 1st pmt due 1.8.2015<br> Pay is instalment 20.7.2015 (10 days before due date)<br> Get phone call 14.8.2015 - account in arrears with R1900 ??<br> Shocked and panicking - check my internet banking. Proof of payment - successful<br> Send email with proof on 16.8.2015 to RCS and accounts dept, - phone them - this will be sorted.<br> Today get phone call again from rude lady - account in arrears?? I ask but how is it then -? She put the phone down in my ear!!<br> Another lady phone me - and I explain that payment was made with all details etc.<br> <br> After sending numerous emails - and making calls to the call centre - this is still not sorted?<br> Can somebody please contact me / correct my account and also see that no interest is charged.<br> If I knew this was going to happen I would have NEVER gone for 6 months interest free but opted for cash!<br> <br>