The state Attorney General's office has gotten a temporary restraining order against a New York firm that allegedly used ads in the Metro to drum up business among homeowners facing foreclosure by promising legal services it couldn't deliver. Among other things, the company demanded $1,500 up front from prospective clients, which is illegal in Massachusetts and also, despite calling itself Loan Mods by Lawyers, it, in fact, employed no lawyers, the Attorney General's office reports, adding the Metro cooperated fully with state investigators.