given the run around since April

I bought a bed that was delivered on the 01 March 2017. The mattress is too hard and I thought it would eventually become softer after use. Remained hard to the extent that I am unable to have a good rest and havd body aches. I contacted beds and all via WhatsApp several times and also sent through a complaint to them via email (no response to the email). Each time it was a different story- once I was even mistaken wanting to purchase a bed instead. The last message received was last week saying that he will get to me the next day to sort it out. This is happening for months now. All I need is the mattress to be replaced or for them to take the bed away anf refund me. It's been a nightmare dealing with them. The days that the person was supposed to come I had stayed at home waiting on him. Empty promises while I can't sleep at night because of the quality of the mattress. Maybe my body is not used to such a hard mattress but unfortunately he had agreed to repair or replace the bed. Still waiting and no apology when he doesn't pitch but when I ordered the bed he was ever ready to deliver and get the money. My body is terribly sore at the moment and I don't think it is fair . If he cannot do anything to assist I need to know so I can chuck the mattress and go for something better but not make me run around.