I've had a similar experience with the spam calls. I don't get quite as many per day, but ~90% of the calls I receive are spam. I just don't answer my phone anymore unless it's my wife, my mom, or one of my brothers. I direct all other calls to voicemail after grumbling about being interrupted.

I haven't found a good solution for auto directing spam calls to voicemail beyond using Do Not Disturb from 8 pm to 7 am.