changing regional ticket 2nd class

Giangilberto from Milan here. Take a breath — your situation is better than it looks, and the thing you regret (one combined ticket) is actually the thing SAVING you.

The rule that matters: when both legs are on a single Trenitalia booking, the connection is THEIR responsibility. They changed the timetable; if 7 minutes turns out not to be enough and you miss the Verona train, you're entitled to travel on the next available service at no extra cost — show your ticket and their email to the conductor or the assistance desk. With two separate tickets you'd have zero protection. So no, buying separately would have been worse, not easier.

About the 7 minutes: Verona Porta Nuova is a compact station — one underpass, platforms close together. If the first train arrives on time and you're not dragging three suitcases, it's makeable. And Verona→Venice runs a few times per hour all day between Frecce and regionali, so even a missed connection costs you an hour, not the day.

The €0.00 refund mystery: that button is the standard self-service flow applying normal cancellation penalties — it doesn't know your case is a carrier-imposed schedule change. For those you're entitled to a FULL refund, but exactly as their email says: through a staffed ticket office (any major station, bring the email) or the online claims/assistance form. Not that button.

So, options ranked: (1) keep the ticket and rely on the protection — that's what I'd do; (2) if you want a guaranteed calm transfer, have a ticket OFFICE rework the second leg — desks can do surgical changes the website can't, free when the change is Trenitalia's doing; (3) worst case, yes — the Verona–Venezia regionale never sells out, second class costs around ten euros and takes about 1h50. But given point 1, you shouldn't need to spend a cent.

One question that changes the fine print: what are the two train types — is Verona→Mestre a Frecciarossa or a regionale?

Also check the revised schedule around the time of your train. The trains from Verona to Venice run fast train, regional train (sometimes 2), fast train again with several connections an hour. Even if you miss one train there is very probably another one in 6 or 20 minutes and the time difference between the fast and slow trains over that distance isn't very much.

I would encourage you to have the Trenitalia app anyway, but especially in this case. You can check to see what track your connecting train is on (or going to be on) as you come into Verona and see your next options if it doesn't work out. At the worst you may end up with ticket you don't use depending on what you purchased. But your schedule shouldn't be much affected and 10 or 20e against the cost of your vacation isn't that much.

As @Giangilberto said - Take a breath and double check the schedules. Verona is a relatively small and straightforward station and there are many options an hour headed to Mestre.

Good luck and have a great trip,
=Tod

Thank you Giangilberto and Hiredman,

This is very helpful.