Has the merchant failed to provide a refund within 15 days of the cancellation of your purchase?
If you paid by credit card, you can file a chargeback request with your credit card company within 60 days.
Further information: If you cancel a purchase, you are responsible for the product until it has been returned to the seller.
As a main rule, you also have a cooling-off period of 14 days if you buy a service online, e.g.
if you book a hotel room or rent a car, make an appointment with a dentist or join a dating service.
If the seller does that, you cannot cancel your purchase.
As a main rule, you cannot cancel the purchase of a service if you have begun to use it; for example, you cannot cancel your subscription to a dating site if you have created a profile.