Lost my sofa

I ordered a 7 seater corner suite on 23rd of August and was told the order would take 13 weeks. I received a text from them last week to say my sofa would be delivered between 7 and 1pm yesterday (monday 21st). On Saturday, I received a call from someone in their warehouse saying that when they have gone to load my sofa on the lorry, they could not find it although they confirmed that according to their computer system it was definitely received. I called their Customer Services, and they informed me that the warehouse was now closed, and it would not be investigated until yesterday. I called yesterday afternoon to ask for an update, but was told they are still trying to find it.
I called them again this afternoon, only to be told the sofa is "missing" and they had not been able to find it, and they would have to order another sofa, which means another 13 week wait.They told me they would call my local Harveys, who would lend me a suite until our arrives. They have promised me 2 x 2 seater sofas and an armchair in brown. Not the colour we wanted but it would be ok for the time being. I am absolutely furious as they have had over £2000 of my money since August, and when we finally get the sofa they will have had our money for 6 months. I really don't recommend anyone uses Harveys. I won't ever buy from them again.