EDIT : WHOA, this is supposed to be in business. Could a mod move it to the correct location?

So, i do commissions for customers and i occasionally run into a nasty customer, or hear of other artists that run into them. What do you guys normally do if you have a particularly... odd customer?

I suppose i'll use art examples since those are the best I can think of:

You have a customer who you complete a commission for, they seem happy with the image, it is sent off and they receive it. After receiving it, they proceed to bash you saying it is not of the right quality (when they are familiar with your work) and they they are going to report you to common artist-beware communities, etc. (or they receive a snake, claim its not what its supposed to be and say they are going to out you to fauna). What is appropriate action in this situation? (if the animal is a het, you have document paperwork and breeding images to back it up, you take accurate beautiful pictures and keep great records that were sent off with the animal).

Is there anything you can do to "cover your bum" assuming you have sound business practices and are honest with your customers?

Any other anecdotal information that is reliant is also welcome. I would love to learn about this.

I know to NEVER send artwork (or snakes) without receiving payment in full and making sure the payment method has cleared so that isn't much of an issue.

I do want to do some small time hobby breeding in the future, and I want to learn how to best solve or avoid these situations in the first place before they become a problem. Any advice for newbie or to-be future hobbiest and breeders?