Hmm ... difficult subject...
95% of customers are lovely , or if not lovely they buy something and you don't hear anything so you assume no news is good news. No one has time to follow up on every customer.
But every now and then you get a total wildcard, when you realise it would not matter what you did they would find a reason to complain, and not only that tell outright blatant lies about the transaction. And when you google them you find out they have a habit of trying to bring others down.
I am not blessed with the patience of a saint and neither am i good at ignoring things, standing up for for myself is built in.
So , lets call them Burt , it's not quite their name but it will do . So Burt ordered a planter that i made as a standard item. I have sold hundreds of this item but magically when they bought it the dimensions became totally invisible and i became the worst seller in the world as they were unable to read. It happens. And the other item was a soap dish , actually my best selling item , but altered to their exact requirements . Apparently it was the smallest item they had seen in their life !
As i said it is a very difficult subject , and when you work seven days a week to perfectionist standards , as most self employed makers do , it can be very upsetting. So i think the best things to do are:
Realise these people are very sad individuals and be sorry for them.
Refund them to get them out of your life and mind.
Do not engage in arguments any further than you need as it is fuel to the fire.
Cancel any further orders they make.
Carry on working harder than ever , success is the best revenge.