You may pay for an order that is later cancelled, find that you have been charged twice, or receive a service that differs from what was promised. Two routes are useful to understand: a refund from the merchant and a card-payment dispute through your bank, which may lead to a chargeback...
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Refunds and Chargebacks
Getting a Refund in Türkiye
Disputing a Banking Transaction
Online Purchase Security
Duplicate Card Charges
