I tend to use my credit cards to easily categorize my spending and get rewards, but from time to time I need to reverse the charges against a merchant for double charges and fraudulent charges.

Recently I purchased some art objects based on the assurance that it would meet a certain appraised value. Skeptical, when I returned home I had them locally appraised and found that they were worth approximately half of the purchase price. I'm considering calling it fraudulent and asking to reverse the charges for the difference.

Any reason that wouldn't be valid? Thanks for the insight!