Capital One review: Lack of support for false charge to account

We were wrongly charged $537.60 by an online travel agency on 8/26. We were told repeatedly by their agent that we would be refunded for this amount.
After approximately 2 weeks we filed a dispute with Capital One. They initially removed the charge from our account and sent us a form to explain
the basis for our complaint .
I sent them the information including the agents personal number and explained that we were told that we would be refunded this amount.
I also explained that we received no goods or services for this charge.
Despite this, Capital One denied our dispute and put the charge back to our account. We have had this account for decades but are now looking for other options for our credit card purchases. Their lack of support in this matter is inexcusable.