I get the call about two times a day as well. I have answered twice and there is no response. I also texted the number and asked that the number stop calling me, but no change. I am in the 801 area code.
They call me multiple times as well and never leave a number. The one time I answered (the first time they called) they said they were a dating service (I can't remember the company name) and was wanting me to schedule an appointment and wouldn't hang up until I did. I never showed up for the appointment and ever since I missed it they have been calling. I also get a 801-203-4090 number that does the same thing.