Another way of looking at this is, if your customer gave the info to a "scammer" who said they'd remove a virus from the consumers PC for $300, and they logged on to that persons PC and did little or nothing that we know of, the card info was provided for a service to be rendered and arguably it was, even if it was a scam or appeared to be after the fact. We've no idea what real service was performed. Sometimes these are to clean a virus, and maintain the PC with driver updates and such. It is a scam, but legally it may not be.
There used to be a scam for tree trimming. A person would agree to $1.00 a branch. Well a branch can be a big limb where 10 make a tree much thinner. But cutting those 10 limbs piece by piece could lead to 50 "branches" on what the homeowner saw as one. It's a scam, but it's one to be decided on in the courts.
But if that tech person in the original scenario then made additional charges, those additionals were not authorized and there was no agreement. Those would be valid claims as they were not authorized.
My opinions are not necessarily my employers.
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell