ER Solutions Curses, threatens and calls several times a day and night on a collection I do not owe Renton, Washington

 I had heard about companies like this, they harass and threaten your credit if you do not pay. I do not owe money to anyone. They are saying I owe more thatn $300 to a company called Entergy. They just started to call the past 2 weeks  and it is becoming more and more frequent, each day. THey only leave a message once a day, they call several times a day. When I picked up I thought it was a telemarketer and I was going to get rid of them. Instead I was bombarded by a rude and obscene man telling me to pay my bill or else. Well Im going to give or else. I would love to sue them for harrassment. Companies should not be able to attack people like that. Its a scam