I do not know why certain people bother to write when they know nothing about the subject. Either you are a telemarketer or you are very ignorant.
1. Cellphones can be registered in the “Do-Not-Call” Registry as clearly spelled out in the Government website: https://www.donotcall.gov/register/reg.aspx
2. The Government can heavily fine telemarketers that break the law and in so doing harvest funding to improve compliance.
3. Yes, I complain a lot because it costs me money to receive unwanted calls. My cellphone provider charges me for that.