Bad workmanship

25 years ago,I purchase a lounge suite from Bradlows that was manufactured by Goma Goma Cape Town,however,with three children the suite stood the test of time and is still in a very good condition.In 2020 we went to House and Home Tokai and purchase a Goma Goma 6 seater lounge suite that we paid R11000.00for the item.one year a d six months later we discover that the back rest foam of the suite was disintegrating.we brought it to the attention House and Home and Goma Goma but to-date the have nor been very helpful.Why must we pay for their bad workmanship? Regards Henry