Bad Service

I bought sealy queen bed set five months ago from Rochester in new market mall. The mattress was faulty 3 weeks later after delivery and I could tell that it was faulty springs from the inside that was making the noise, we reported the problem and a technician was dispatched to our house to have a look and he confirmed it was factory fault. We were promised that the mattress would be delivered within a week. it’s been five months already and we still haven't received the new mattress as promised. I asked for a refund three weeks ago & I’m still not getting any response from Rochester. I spent hundreds of rands on airtime and Petrol driving to new market mall to find out about the progress on the matter and I’m still not getting any joy from them up to date. thank you so much Rochester.