Cash Advance Said there taking legal action against me for owing money Internet

Recieved an email from a david williams (david.secure1@gmail.com) representing Cash Advance stating I owed money to a cash lending service that is affiliated with them that I never borrowed from or recieved! Said I borrowed $830.00 and if I didnt respond to the email they would be contacting my employer and local sherrifs office and I would be taken to court! Said I had to electronically sign the email and agree to their terms or they would report me to the credit service as owed and not payed unless I took action! Said they would take me to court and I would have to pay them $6,600.00 if I didnt agree to pay them $830.00 by signing the attached electronic signature attachment.