If you are facing any problem related to avast softwarethe avast customer support will help in 24 hours and 7 days, then you get the solution via calls or support chat.
You can upload your query on the official avast site
And you can take help from avast forums also.
If any solution does not work for you then you can try the subscription version of the avast.
Read More:- https://cleanersuite.com/avast-background-service-not-running-windows/