score:11
I live in Italy, so I've just called the freephone number and the number is "non abilitata" which means it no longer works. I called the landline and the new number to call for public transport is 0323 518611.
Obviously, at this hour (currently it's 19.30 Italy time) their offices are closed. But you can call Mondays to Saturdays from 05.00–19.00. Speak to the person in charge and they should be able to inform you if they still run the bus service from Turin to Verbania.
UPDATE
I just called the bus company (press 1 for timetable, costs, lost & found, etc.) and unfortunately, the service is no longer running. The OP will have to look elsewhere. I'm sorry.
I would email the hotel, or the airbnb etc. where you are staying and ask them if there are any buses running that will take you to your desired destination. Failing that, take the train. Trenitalia.com is a fast and reliable website, and train tickets are very cheap in Italy compared to the UK. You need to know the exact name of the stations though, it's not enough to write "Torino" and "Verbania"
I've done the search and this is the cost for two people travelling one way, departing August 5.