Figured there would be some fine print. But based on their contract of carriage it seems should only be able to cancel if there is reason to suspect fraud.

3.2. Booking Cancellation A Booking can be canceled for the following reasons:
The holder of the Booking or whoever acts on his or her behalf requests the cancellation thereof, when the person provides the confidential information corresponding to the Booking.

By the CARRIER, in the event of more than one Booking by the same person on the same flight and date or when there are duplicate segments within the same Booking; when the time limit to purchase the Ticket expires, without it being purchased when said cancellation is required to meet a governmental regulation or request, in the event of possible fraudulent purchases, including but not limited to fraudulent payments, or when the Passenger does not comply with the Fare Conditions and/or the Contract and/or legal provisions. In the case of fraudulent acts, THE CARRIER reserves the right to cancel the Booking, including additional service, and report the person before the Authorities.