Complaint Review: Environmental products international inc

I was badgered into finally saying yes to this company sending their product under the assumption that if I didn't want it I could return it and not pay anything. They had been calling at least once a week so I finally said yes they could send it. I received it, talked to a friend who works for a septic company and he told me not to use it and send it back. So I sent it back. The company has been threatening me with collections and lawyers on a product that was returned to them.