Canadian Online Pharmacy US Online Pharmacy scam, violate do-not-call, aggravating Unknown Internet

A few years ago I bought Cialis from them not knowing is was not the real product.  Seems to work but they call every day.  I told them I have 3 years supply so dont call.  they continue to call.  They have told me over a dozen times over the past 2 years that they are taking me off the list, yet they keep calling.  changin phone numbers every few weeks sometimes using 3 or 4 different numbers in the same week.  Sometimes calling from hidden or private numbers.  I am on the do-not-call list which they ignore.  I have tried talking to them, pleading with them, ignoring them for months at a time, threatening them, shouting, etc.  Explaing that ther are wasting their time and violating my privacy.  All to no avail.

My last resort which I will unfortunately have to take soon will be to change my phone number and never give it out to these creeps again.  I have used call blocking apps but the calls keep rolling in with a 5 or 10 second blank voice mail which I must ignore.  The problem is it is a google number and my Chome on my work desktop starts ringing for a few rings before the call blocking on my phone silences the ring.  very annoying.