denovo wrote:I've found an interesting way to deal with that. I tip using an algorithm, so if I scan the credit card bill I can figure out if there is any mickey mouse.
So if I decide my total bill will be around 23 dollars. I add 2+3= and make it $23.05, $51 would be 5+1= $51.06, granted some numbers will repeat, but it will detect most fraud I guess.
I like that. Other than keeping original receipts (to scan) for warranty purposes on larger items, tip fraud is the only thing that I consider likely. I sometimes take the receipt to confirm against the statement later, then I forget or don't bother. Your approach makes it obvious to you that something's amiss.
Lacking a receipt, though, you have no way to prove anything. As another poster wrote, I wouldn't go back to complain, I just wouldn't go back. If it was a place that I'd frequent due to other conditions (fast lunch place with good food near work), I might complain if I thought out was intentional and that it might result in correction. If infrequent and small, I wouldn't bother. I don't want to waste my time contemplating the ethics of other people.