What is the evidence of the authorization? If it was authorized, it was authorized. But if the customer has a receipt for $100 and it was $200, I'd say the authorization was exceeded and the claim may be valid.
In any case, the investigation must be documented and carried out according to your procedures.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell