phone calls with no one on line when picked up.

I got a call from 206-317-7518.  When I answered, there was an auto message stating it was the IRS and I was going to be sued by them.  It urged me to call another number.  They are calling me at least once an hour between 9 am and 8 pm every weekday from various numbers.

They called me to im not sure who these people are but if its a irs scam i will report them into the police