There's an errant and somewhat over used term that gets bandied about far to often in the goods and service industry ... and that misnomer is that " the customer is always right".
I can tell you from vast experience that the customer is more often wrong than right ... but that doesn't alter the fact that the customer needs help. Whilst the customer might not be right, they have rights, as does the service provider.
A customer is someone that needs something ... its that simple. The provider supplies that something, be it goods, service, advice ... whatever. If the client is not satisfied, they need to communicate with the provider in regards to their grievance. More often than not, after a calm and reasonable communication process, an amicable solution is forthcoming.
But ... every now and then you get a complete plonker who refuses to view the situation objectively, and insists on making the situation far more difficult to resolve than it should. Either party can be guilty of this, but regardless of who instigates the abrasive discourse, both sides suffer during the process.
A retailer never wins an argument with a customer, they just alienate and lose the customer. And in kind, the bullish customer garners little respect from anyone, especially the target of their vitriolic diatribe.
I'd like to complain ... ouch ... what was that for ?
Oh ... sorry ... this is being hit on the head lessons.
EDIT: SORRY BACK TO CAMPING ...