Systems and methods are provided for blocking charges from a merchant to a payment account of a user. An exemplary system may include one or more memory devices storing instructions and one or more processors configured to execute the instructions to perform various operations. The operations may include receiving, from the user, a dispute request to dispute a charge to the payment account applied by the merchant. In response to the dispute request, the operations may include determining whether to block subsequent charges applied by the merchant to the payment account, based on a history of charging activities of the merchant. Responsive to a determination to block subsequent charges, the operations may include adding the merchant to a block-charge list associated with the payment account.