Get your money back NOW.
Don't wait on it.
And as a business owner, I have received several chargebacks to my biz, there is no legal dept involved.
You dispute the charge, give your reasons, and the credit card co will send a letter to the vendor giving them about 2 weeks to respond or they automatically get charged back and you get your money.
You paid in good faith, and I know that sheet happens, but too bad on them.