Good afternoon @mdcrvb, welcome to the community,
You can cancel your subscription by calling UPC or going to a UPC shop.
If you think you are paying for something to expensive, you can also have a look to the new UPC’s offer and bundles. UPC can bring you TV, Internet and Phone for only 89CHF/month or Internet and Phone starting at 59CHF/month.
It is up to you to decide what you want to do with your subscription 😉