Useless Accounts Department 2nd time paid and doesnt reflect

Last year made a "Successful" payment through the truworths paylink and never reflected on my account,guess what same thing happened today,the day im sent a statement is the same day the payment is due. I called customer services and im told not to worry it takes 3 days to clear,never mind last year it never ever cleared and i made a 2nd payment. Useless when my credit record is at stake! ***** your accounts department!