[quote name='confoosious']there's no way this justifies time and effort of a class action suit.[/QUOTE]
Exactly. First of all, as kodave pointed out, only those people who have actually been charged would qualify to be in the class. While that number may eventually number in the hundreds (I'm doubting thousands -- our box of cancellations was what, 760-something?) if they keep charging people, right now it's much lower.
Secondly, no lawyer is going to take this on. A class action suit only works when the damages which can be claimed are enough to pay a significant legal fee as well as satisfy whatever settlement occurs for the class itself. Even if they could somehow claim damages that large, what are the chances that the ECA could afford to pay it?
Third, class actions usually occur when the offending company refuses to acknowledge and/or chooses to ignore an issue. If this were to somehow actually make it to court, the moment the ECA went before a judge and said that they were taking steps to rectify the issue prior to the suit being filed (no matter how retarded we may think that those steps are), the case would get thrown out. If the checks never arrive, or if they bounce, or if charges happen again next year, then you might have an actionable issue. Until then, not likely.