my fault but i got bamboozled by a customer

i had a feeling this would happen

i had a shop and pay order at a grocery store, just several things. customer wanted an eye drop but it wasnt available - only the twin pack version was. i couldnt suggest it on the app because it exceeded the original amount by double. i tried to help but customer kept replacing it with the wrong item.

ok no problem, i'll refund it and pay it out of pocket. customer suggested etransfer but i said to increase the tip to cover the cost of the item.

now 2hrs later, not only did the customer not compensate me for the original item, they reduced the original tip to 0.

im fucking baffled.

i couldve just refunded the item and finish the rest of the order but decided to go the extra mile but i got fucking burned instead.