If the credit card company overrules your objection to the charge, you have a right to an explanation of how they arrived at their decision. Moreover, you have a right to demand that they turn over all documents that they reviewed in their investigation into your dispute.
Its far easier to just let us review your matter and see if we can sue the merchant and credit card company and get your credit card statement right. You have a very short 1 year statute of limitations to file suit, starting from the date that the credit card company receives your dispute. Time is not on your side. Moreover, if you refuse to pay the bill without taking legal action, the creditor has the right report you as late on account to the credit bureaus. This can trash your credit score. Your better move is to take action and sue them.
If we have to file a lawsuit, we will not charge you anything out of your pocket for our fees and costs. We will only look to what we collect on your behalf from the defendants, for our fees and costs.