There are two types of such windows

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These pop-ups are designed for people who want to get quick information about a service while talking to a live consultant. .
Assistants
The user is asked if he found what he was looking for. And if not, he is offered to order a call back so that the consultant can explain everything in more detail. Sometimes such windows pop up even before the user has time to scroll down the page, but more on that later.
Spies
These pop-ups tell the user exactly how much time he spent on the site, and whatsapp number listthen offer to call back for a consultation. It is difficult to explain how information about the time spent on the site motivates the user to order a call back. Such messages are rather frightening, especially for those users who are not familiar with site analytics systems.
Functional
Such pop-ups are perceived as part of the site interface and do not irritate users. Usually, these notifications pop up after the user has performed some action: sent a request via the feedback form or made an order.