If you have made a purchase with your card, and while you have returned the product you have not received a refund, you will need to contact the merchant in writing to check the refund process.
The refund will be released up to 12 days later. You can check this by logging into your account under "Accounts > Primary > Details"
If you have already contacted the merchant and they have not informed you or reported the agreed-upon details, you will follow the dispute procedure.