Is ther Any company in London, UK named as dexxon oil and gas company, bloomsbury way, london,who offered very

This people send official offer letter, with fabricated letter, fake website from which no one can get the information about company. Three groups are working, Agent : UK travel agency, who send HSMP VISA form and fee 1200 GBP, Offer letter signed by Thomas Jones, when I asked Hard copy, they said they will give that once I pay the fee, which looks to be normal.