Dispute
I normaly don't take the fight beacause I am afraid it's going to be dirty.
If I pay upfront and if I am not satisfied I see the money lost, and one more lesson learned.
If I doing a service for someone I always try to do the customer 100% happy, if I dont manage to succed? I send the money back. If I am not sure to deliver great result I will not take that job.
So I have never got an unhappy customer.
Wibble, bark, my old man's a mushroom etc...