I am sure that many are tired of telephone spam with calls, where the robot offers you either a loan, an Alfa Bank card, or legal assistance.
Installing call blocking applications is ineffective - there is always a risk of a system error and dropping / missing a call on business.
Therefore, I propose to fight spam with purely economic methods. All of these spammers have hired employees who process requests, call back, and so on.
Therefore, for any such call - ALWAYS press "interesting", "leave a request", etc. When they call you back, you can mock, scoff, you can calmly say not to call you again.
The more empty requests there are, the more spammers spend their employees' paid time processing these requests, the better. Sooner or later, the spammer will recognize the economic ineffectiveness of this kind of "advertising" and abandon it.