I made an offer on a property which was accepted. A day later I received a call and was told that a higher offer had been made by another bidder. I was given the chance to increase my offer, but I refused out of principle. If a sale is agreed then no other offers should be accepted after that. If I was outbid before my offer had already been accepted then it would be fair enough. The estate agent explained that this was the vendor's decision, but I feel that I was used as leverage to get a higher offer from another bidder after the deal had been done.