my furniture lost at their warehouse

Morning<br> <br> I am a customer at Rochester furniture stores, I bought a lounge suite last year October and it was delivered to me with some factory faults. I had arranged with the branch to be fixed. They came collected the whole lounge suite and after 8 weeks it was returned to me without been fixed. I again went to the branch to launch another complain and again it was arranged that they will come collect. Then they came first time to collect only 1X single seater couch and I called the branch for so that they come again to collect the rest. Indeed they came and collected the rest of the lounge suite. After a few weeks they returned the 1X single seater they took and this time it was fixed. Now I am currently trying to get the rest of the lounge suite back and they telling me that they don't have any proof that they collected from my house, but they were the ones who called me and arrange for collection. Now this thing had been dragging on for long and I need assistance from you. Another unfortunate thing is that the delivery note they left with me when they did the collection is been lost or thrown away at home and I don't have anything to show to them.