HORRIBLE CUSTOMER SERVICE!!!!********* PRACTICES

I was asked to pay my account and will receive a paid-up letter within three working days of receiving my payment which they said will reflect immediately. It is 5 days now and Nicole is telling me that the proof of payment was directed to the wrong department and there is nothing she can do but wait!!!!!!!!!!!!! EVEN THOUGH I HAVE SHARED WITH HER THE SAME PROOF OF PAYMENTS THERE IS STILL NOTHING SHE CAN DO!!!!!!!!!!!!!!!!!!!!!