It's very easy. Your allowed to block up to 10 numbers for free with most carriers. Just go online with your carrier to find out how. But my favorite is to answer and order several 100 types of medications,  then when they ask for your creditcard, tell them they only let you have a cell phone in prison and that you get out in 20 years. Lol. .pisses them off since their paid on commission.

maybe go on the internet and get a good farting video. Then pretend to talk and say, do you have anything for gas..and then turn on the fart video and just sit the phone down on it while it rips.

It is well past time this company (Canadian Pharmacy) be permanently taken out of business. They serve no purpose other than to annoy people regardless if you are on the do-not-call list, which is a joke!  They obviously do not care or abide by any professional courtesy. I am not sure what we can do, but I remain hopeful that some day we will read how they were eliminated and are no longer in operation.

the do not call list doesn't work on this number answer and give them a piece of your mine that about all.

Not too big a piece