Does anyone know of a Firm in Leeds called * MCN please?

Has anyone got a Telephone number for this Firm who are supposed to be in Leeds. The one I got and tried to phone was answered by a Girl who after I had stated my business ... put the phone down on me, and when on trying again was told it did not exist....They have already taken �600 from my Bank ... but they do not know who they are either. I have no debts.. so what is it for..,.... anyone help ?