Originally Posted by Often1

Interesting. Amex is known to be very pro customer. Thus, when a chargeback is denied, there is almost always a very good reason.

However, chargebacks are not generally a means to dispute service you found lacking or as a set off for other matters, e.g. damage the repair facility may have done to your vehicle. Work that was not completed is a different issue and should be subject to chargeback, but may have gotten buried in the mix if you also used the process to complain about poor service and other damage.

It may be too late now, but perhaps try starting over with a very simple dispute for the value of the work which was not completed. If, for example it was a $5,000 repair job and you can reasonably prove that $500 worth of the work was not completed, then dispute the $500. Leave out everything else.

For the other stuff, e.g. poor service and damage, you may either work that out with the facility of file a small claims action against it. But, that is not what CC disputes are for.