Account not credited after 6 months of return

I bought sunglasses from sunglasshut on my edgars account from somerset west mall edgars. I purchased the glasses beginning of december and returned it within 7days of purchase date. First they didnt submit my credit forms to the head office. I returned to edgars after 3 months to sort it out and they submitted the forms again according to them. So after taking there word for this being another 2 months later my account is still not fixed. I've been paying the monthly installement on my edgars account even not having the sunglasses i'm paying for. I cant purchase anything on the account due to the fact that I reached my limit for sunglasses I returned that i'm still payimg for. This is very unprofessional from edgars. If i dont pay for the glasses i dont even have i get sms messages from edgars telling me to pay my account or they will take futher steps. Im closing my edgars account as soon as this is sorted if edgars doesnt fix it or make return for all the interest iand money i already paid on my account.