Call up the background task page of the mobile phone to see if there is any application corresponding to the pop-up advertisement. If there are money-making applications such as cleaning, WIFI and walking, I suggest you uninstall the corresponding software and use observation (you can go to Settings-Applications and Permissions-Application Management to see if such applications are installed).
If the above methods are not effective after operation, you can go to official website /vivo Mall APP-My-Online Customer Service or vivo official website Web Edition-Sliding Bottom-Online Customer Service-and enter the manual customer service for consultation and understanding.