credit card review

In a recent transaction where I was paying by credit card I was overcharged by the vendor. She realized it on the spot and refunded the money. However, when I reviewed my credit card statement I found that they’d issued two additional refunds to me which amount to several thousand dollars. This is all in excess of the amount the needed to refund to me. What am I supposed to do? What is my obligation? Can I just sit tight until the company figures out its mistake?