While random pop-ups may be annoying for a customer, a business uses it for different purposes such as gathering feedback, which is vital to keep the product running like a well-oiled machine. You may observe pop-ups like above on your dashboard asking for your feedback on the call quality. Your feedback will improve our ability to serve you better. 

In case of any issue related to the pop-up, please write to hello@exotel.com

Refer to this article for few tips on improving call quality at your end.