Why was buying a Harveys sofa such an uncomfortable experience?

The cushions went flat after three months and we were forced to sit on the floorWe bought a sofa and chair from Harveys which arrived in mid-November last year. By the end of January all the static cushions had gone flat and so uncomfortable that we are now sitting on the floor. Harveys sent an independent assessor. He weighed the cushions and said they were OK so there was no manufacturing fault. It then refused to take it further. I pointed out the cushions are so flat we can feel the springs