There are no penalties if you've accidentally paid more than you owe, and there are laws in place that require issuers to refund your overpayment. There's no penalty for overpaying your credit card.If you let it sit for too long they'll mail you a check eventually. There's no reason to have a negative balance on your card on purpose. If you overpay your credit card, you can request a refund or keep the negative balance until you make new purchases. If you overpay your balance, this could mean you free up more available credit, leading to a lower credit utilization ratio. Log a dispute with your credit card company. Please give the exact details of the charge like the merchants name, date and amount. When you overpay your credit card, extra funds generally remain as a credit on your account. But there are more options you may consider.