Nicholas Camera Company Bought a perfect condition camera from us worth about 3000 and we accepted a cheque for 1200, the cheque cleared and then a couple of days later the cheque bounced back and we are still dealing with London, Other

This shop bought our camera with a cheque which cleared and then bounced back a couple of days later we returned for the camera or money back and he stated that police had taken the camera from him as it was reported stolen from someones property, I have a friend in the police who checked the records and confirmed the man in Nicholas Camera Company was lying. We returned to the shop with this information and he just said that he would only pay money back to us if we return his cheque as it links him to us but he doesn't realise that the cheque details are already on the bank account, he also tried to make up a fake policeman to say he was involved and again once this was looked into it was a lie, so it is now going to be dealt with by the police because he is trying to use the police to make money so he will be going to court!!!