Contact your credit card company or PayPal – do NOT contact the website or seller that sold you the DVDs. Your credit card company is there to protect you from fraud, and if you report a bootlegger, your credit card company will open an investigation which will most likely result in a refund. If a credit card company receives enough complaints, a seller’s credit card processing abilities can be revoked.
Most credit card companies will give you 90 days from the time of the order to dispute the charges; PayPal will give you 45 days.