They call me constantly!

Canadian Online Pharmacy calls me constantly and is harrassing me despite me being very forceful with them and telling them not to call, that I hate them, everything thing I can think of I say as they have been doing this for going on 6 years! There has to be something that can make them stop.

They call from tons of different numbers and have called me 4 times in past 2 hours from 3 different numbers:
7133576303
8172600614
5756528450