We recently took a large build-in cupboard out of our spare bedroom to make it into a much needed bedroom for our 7 year old and soon realised the room needed plastering. I rang up a local plasterer based on recommendations from friends. After he visited he sent me a price on Facebook messenger (which I thought was a bit odd). It seemed very high based on other plastering work we have had done but we agreed as we desperately need to be able to use the room. He thought the work would take 4 days but he finished in 2 and he's just sent me the bill for the full amount. It says on the bill 'as per quotation' but I am not sure a Facebook message counts as a quote. Should i query it?