Bad Service

Please I am looking for advice on way forward. I purchased a bed from a company called Beds and All in Vereeniging on the 10/08/2016 I had a friend come vist who slept in the bed 60 yrs old, there after my 12 yrs old son slept in the bed for two night said then not happy when he turns over there is a knocking noise, I said that must be the base. I phoned beds and all to come have a look they said nothing wrong, my son is the problem, my husband tried it and said there is differently something wrong . My son never slpetin the bed again. A friend came to stay over for two nights said didn't want to be rude but something not right with the bed. We then noticed matters started to sage, phoned Beds and All, they came out said not there problem they will ask the suppliers Viva Beds to come see us, she emails them tell them I bought the bed on the 28th April, which is not true I have my receipt it was the 10/08/2016 4 weeks a rep from Viva beds comes out, has a look and leaves, we then get a email from Beds and All saying we damaged the bed? I phone up Viva Beds and that's when I find out about date of purchase I explain my story that its been used a spare bed all of about 4 people have slept in the bed ect they then tell me my receipt is wrong and we damaged the bed. I have not damaged the bed and its clearly a factory default I paid R1999 for the bed hardly used and now can't be used at all, both above mentioned companies tell me not there problem. Please what can I do.