Hi, longtime lurker here but don't post that often, so if I'm in the wrong place please let me know.

We (thought we were) flying TIJ-MZT.
Departing April 6 on Y4 592 - changed to April 4
Returning April 10 on Y4 519 - changed to April 11

No notification from Volaris at all. We found out when someone else on the same flight told us that their dates were changed too. We bought CBX tickets at the same time and had gotten some emails from them. Looking back at it, these flight changed dates three times! CBX Change notices sent on Nov 10th, Nov 11th, and Dec 19th.

We have confirmed plans in Mazatlan that are absolutely inflexible. How are they able to move the dates, and how can we get them to stop doing it?!

Did we book the wrong type of ticket?

It is very hard to book a flight to MZT around this time. Do I have to call someone and pay extra, or what can I do?