"Force post" transactions are when a merchant charges a card without a prior authorization. Unfortunately, it isn't something that Privacy can block.
But I set a limit on the card? How did they charge me?
Broadly speaking, merchants only resort to force posts when they are faced with the potential for serious loss as a result of fraud. For instance, if you rent a car and don't return it, having a limit on a card or closing the card does not absolve you of the responsibility to return or pay for the car and the merchant has the ability to force post the charge.
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If this happens to you, contact us at support@privacy.com and we'll work with you to try to resolve it.