OP asks whether he may obtain a refund.
Simply call the US #, put the phone on speaker + mute and multi-task. It should not take long in any event. Make it clear that you wish to cancel for a refund and that ought to take care of it.
Both EC 261/2004 and US DOT rules require that refunds be processed within 7 days. Thus, on the 8th day, if you have not received notice that your refund is forthcoming, you should initiate a chargeback with your credit card issuer (bank).