You are entitled to a refund. The current schedule brings the connection below MCT and must be rebooked. You need not accept a rebooking and may therefore have a refund.

Do not accept anything. While it will not necessarily harm your ability to obtain a refund, it makes no sense to do so and will make the process immeasurably harder.

Because you need to be able to decline the reroute which AS will inevitably propose in order qualify for the refund, a call is likely in order and can save a lot of time later. Europe should not be an issue as Skype and most VOIP service calls to US toll-free numbers are toll-free as well.