IRATE RCS CUSTOMER :(

I used my card to purchase an item from Edgars in October and returned the item a few days later. I received a credit note and to date have not received my credit :( In the meantime I have sent numerous emails and spent hours on the phone with no joy in getting my credit :( :( The sad part is that they continue to charge me interest on my account and because I didnt make payment, they have handed my account over to collections (Note: I have always paid my account timeously). Its so sad that you have to wait for your money (including interest), but they can ask for theirs. I would like an urgent response regarding this matter. IRATE customer