I already did write a compensation letter to Avianca. It eventually took them a few weeks to answer, that they wouldnt be able.
THere was no explanation why the flight was cancelled.
By the time they answered, the timeframe for any compensation from my tavel insurance was already over...

We were hoping there would be a law or some kind of rule that entitles us for a refund at least for our aditional transport and accomodation expenses...