I have therefore no sympathy for cold call phone sellers. In general, if one doesn’t opt-in, they should not receive these pestering calls under a B2C prism.
I can't say how it is in other countries of the world, but I have the opportunity to enter my phone number in a register that is simply called "Don't call me" and then no one is allowed by law to call me and sell something over the phone. Personally, I have nothing against those who try to earn a living in an honest way, but if someone calls me every day and offers the same service that I have refused countless times before then it is harassment and nothing more.
You are completely correct, still could you share how would you do it? Thanks!
Read the post again, I wrote you how I would act - but also that randomly calling people from the phone book and selling some kind of crypto-trading service will not bring the desired results. It is true that many have heard of Bitcoin, but how many of them actually know what it is all about - not to mention trading which is very risky when it comes to cryptocurrencies.