Canadian Pharmacy Harassing phone calls, multiple phone calls Nationwide

The Canadian Phamacy calls me at least once a day from some number I'v been unable to block.  The current number is (917) 259-6500 but there have been other numbers.  They never leave a message but if you pick up they reverse connect you to a live operator in a manner that looks like they use an autodialing computer with a database.

Calls come anytime from 7:00AM to 8:30pm on not just my cell but my phone phone and my wifes cell.

Other people I've causually talked to have the same result.

Other phone numbers are (240) 345-3890, (330) 492-0400, (604) 321-4550, (609) 848-8300, (202) 455-4923, (509) 739-7745, (810) 580-5017, (509) 646-8945, (660) 992-4396.

Now my phone company only lets me block 5 numbers so I figure there should be a law as to just how many phone numbers can be used by a single company to harass telephone users.  I think 10 numbers is excessive.