The FCC allows people to complain about robocalling. It's awesome, and can be done here. It only takes a few seconds.
They released a list of phone numbers that had complaints lodged against them. With this in mind, I created a vcf file containing all these numbers. It's a contact you can add in your address book.
- Download the vcf file from here.
- Install it using a method below.
- Block the contact. (Or just #ignore when the caller ID says "Telemarketing").
Drag & Drop the vcf file to add it to google contacts.
I recommend adding a vCard via iCloud.
Download the vcf file linked above to your phone, then click it. Your contact app will open it up.