Bad Customer Service

I must say I'm beyond disappointed with Woolworths missing payments departments. I have been trying to get this department to allocate the funds that I have paid for my account but to this date it has not been done and now they have charged me double interest for payment done. I have called in so many times, sent countless emails to them but no one got back to me till to date. I have given them all the required proof for the payment done for my account but still funds have not been allocated and now I have to pay double what was my initial payment for the month of Sept. Well they need to sort themselves out because I am not going to pay it and the 24-48 hour has passed long time ago for them to rectify this but nothing. I'm sick and tired for calling in speaking to a different consultant and relating my issue over and over again. I expected them to act with some sort of professionalism but very much disappointed as its clear they don't care...