Who called from 3105558136

I keep getting calls from this number 31055581360 every day 3 or 4 calls a day they just stay on the line but they don't answer plz stop calling.

It is from a solar company wanting to put solar energy on your home. They have about 20 numbers. I keep blocking them and they keep calling. I told them I already have solar and they continue to call. I have asked them to stop and they continue 3 to 4 time a day, including sundays.