I am in exactly the same situation.
I signed up to a Trio package on the phone and a big incentive was the waiving of the sign up/installation fee. Guess what shows up on my first invoice, 79CHF.
Customer service takes my phone number telling me that somebody speaking English will call back. I have asked twice in the last two days. Nobody calls back.
Also, I signed up in the middle of the month of August and was told that the charge for that month would be pro-rated. I have no way to confirm that as my first invoice is NOT itemized. I just see 146.89CHF as “Subscription prices and additional services”. No idea what that money is. Trying to obtain an itemized bill also a nightmare (see my other post on this issue).
Somebody at UPC is not doing a good job.