Can a merchant issue a second charge for another service to the card without the cardholder approval?

I approved a charge on my credit card by telephone for my adult son at a dentist. The dentist then charged a second separate visit for additional work without asking me for approval. I am fighting this, but my credit card company is not helping much. Do I have recourse?

The dentist should have a signed authorization. Have them produce it. If they can’t then challenge the charges on that basis. Fill out the credit card company’s dispute form (it’s very important that this be done so there is a written record). You do not have to pay disputed charges until the matter is resolved.

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