Briggs law firm United personal loan Collection agency Internet

 I been contacted through email by a law firm called Briggs law firm. They continue to insist that I took a loan over 1250$ When I know I never did. They threat me with charging me with so many charges if the amount isn't paid. That I would have to go to court and all the fees that come with it would be over 8k. Their emails don't even provide a number to call back. So I continue to ask them to provide information and proof of such loan in the last 4 emails I sent to them, yet they still don't provide it. They just said it's a loan I took out but no information of such. Haven't received and email back since I told him I had an investigation going on about this. So watch out for them.