Well, they did call back but they didn't offer alternative carriers and just told me to email for a refund. I wish I'd also asked about compensation but I was half asleep and the lady was very hard to communicate with in English. According to the airline T&Cs it looks like I should also be entitled to compensation equal to 100% of the value of the ticket. Under GACA rules however I'm not entitled to compensation because it's more than 60 days before the flight.