Harassed And Fed-Up!

Hi. I'm not an average good paying customer that everybody else might be, but I'm outraged by how call centre operators keep calling me like the 1st thing they see when they login to their machines is my name flashing! I was due R1618.07 by the end of the month of September and my account would be cleared! Of which I paid the full, total amount on the 5th of Oct at 18H38 via EFT but keep receiving text messages & calls that I'm on arrears and I've paid the damn full payment! I forwarded the proof to the finance department and they apologised saying this will be sorted, to my surprise I get people blowing up my phone 24/7 saying I'm ****** overdue! I am sick & tired of the damn calls and want this to be sorted out ASAP, I have rights as a consumer and feel harassed for senseless s**t! Sort out your systems and give notice your call center people to STOP calling people senseless to pretend they're doing something to pass time! I'm gonna take steps regarding this and if I'm declared to have a bad credit record because of this, this won't be the last of it! A promise!