Account not updated after MONTHS of requests

So upon creating my Edgars account when I bought my Playstation, I was told that new accounts are on a 6 month payment term, and this can only be changed after 3 months . So on the fourth month, I phone to have my account switched to a 12 month payment plan. I was assured that it would be done. The end of the month came, and I receive my statement, still reflecting the 6 month payment. So I phone, complain, and request once again that my account be changed to the 12 month plan. The call centre once again assures me that they are processing it because it was never processed on their side. So here we are, a year later, and I STILL cannot have my account reflect the 12 month payment plan. I'm STILL struggling to get any sort of help from these people. And I'm the one who has to suffer every month because of Edgars' negligence. I think it's time I speak to someone regarding CPA. Because this is utterly pathetic.