Prepaid reservations that are made through the travel websites or your travel agent may or may not be cancelled, the policy on this varies
. You will need to check the confirmation email they send you to see what the policy on cancellations is. If you are allowed to cancel the instructions will be clearly explained and you will need to follow them. Even if you can cancel your Prepaid reservation there will likely be penalties involved so it is a good idea to try to avoid this if at all possible. If you are able to cancel your booking the refund will be credited to your credit card, how long this takes will depend on your bank but expect at least 3 days.