bad service at Home choice

I bought a 3 seater couch in July 2017 at home choice on a 36 months installment. when they delivered the couch the invoice stated that I must pay R900 end of the month , i didn't pay it because as per my agreement with home choice is R499 for 36 month , the following month when sent a statement they said im in Arrears, I queried by phone calls how the Arrears came about they were clues then I told them that I was a bit taken aback when they delivered the cpuch and the invoice said amount due its R900 , I sent emails which they never respond but care to acknowledge receipt. i phone get to be attended by different agents telling different stories I even asked them which I still ask please "play the telephone recording" when I placed the order. What I annoys me most they dont address this problem even after escalating instead they continue sending me threatening messages about my credit record. for example today they sent an annoying messages that if I dont pay Arrears, it will "damage my credit profile" , they then phoned when I was busy explaining they hang up on me and didn't get back to me . Can Home choice attend to my emails , sort out the issue of Arrears, play the telephone recording for clarity , etc, etc, ,