Bad billing and failure to help

The Black credit card that i have with Woolworths, i ether pay it at a till in woolworths at a till or most of the time by way of EFT from my Nedbank account. On 10 November 2015 i paid R2000 the money has not been allocated into my account. Again on 2 December 2015 i paid R4000. My balance keep decreasing to show that the money has not been allocated yet. i even suspect that even the payment i made in September has not been allocated yet. The Call Centre agents are getting more useless by the day and i am getting tired as i pay that credit card than any other card that i have. Can someone competent and willing to work sort this mess up because i have send my bank statement by emails *** & [Email Removed] Stop sending me from pillar to post it says a lot about how much you are failing one of your loyal Customer.