Airline keeps changing my flight time. What can I do?

Not sure which airline that you are using but try to go to their website,

open your reservation.

Normally they offer you the alternatives, including switching the flight or

full refund if it affects your schedule. I believe it's it less than couple of hours,

you can't get refund, but if it's more than that, you might.

It's usually the national aviation authorities who change flight times. The airline just gives you the bad news. Every time the flight time changes, the airline is supposed to offer the alternatives of a refund or a free switch to another flight. However, if you need to fly on that day, the changed flight time is the most suitable option for you.

You have to accept the changes pretty much. Airlines don't tend to change flights for no reason. I assume you've spoken to them about it.

Assuming you're flying with Swiss Air, airlines all belong to the CAA (Civil Aviation Authority) so you can contact them for advice.