Credit Bureau not correcting altered accounts

You are there to ensure that nobody is getting bad service, but somehow trying to change details is the worst service of all! Our one account has changed from R1442 to R772 per month, but after THREE months you still show the OLD amount even after we instructed the company SEVERAL TIMES to tell you to correct it! Between their credit department and your capturing staff someone is at fault. I gave you BOTH a bad rating as I don't know which one to blame for this blunder!