I usually take the following approach. This is an example with my car, so please bear with me
Me: Dear Sir, my vehicle is making this funny sound.
Them: Yes that is a funny sound and it comes from such and such. Would you like us to repair this for you for $$$$$.
Me: Yes please, but please be aware that I will check my vehicle prior to payment and I will not pay you if the problem is not fixed. Should this unthinkable case happen we will renegotiate the deal.
Them: No problem, we are sure this is the solution, we have done that a hundred times before.
Them: Dear Sir, your vehicle is repaired, please pick it up.
Me: Thank you, would you mind showing me your excellent work.
Me: Sorry Sir, I might not be a mechanic, but the funny noise is still there, how is this possible?
Them: Oh, it wasn't there when we tested it this morning, we have to check it again.
Them: We are sorry, but such and such needs to be repaired.
Me: That is okay, how much are you going to charge me for that?
Them: That would be another $$$$$.
Me: Sorry, but that would only be the last sum as to our agreement.
Them: But we did the work and you have now a shiny new such and such.
Me: That is nice of you, but the two parts are not related and I did ask for your expertise in fixing my vehicle and not for changing random parts. I however do not mind if you replace the new one with my old part.
At this stage it got a little nasty but the service manager quickly resolved the problem and I only had to pay for the real part that I needed plus labor.
To sum it up: Always stay friendly and stick to the issue. If you declare that you trust them to be experts and you are only willing to pay the agreed amount if that has solved the problem, they will either say go home we are not interested in your work or they will accept it. A workshop is not the only party that can add clauses to a deal.
BTW: I am now 9 years with this repair company and had only one incident so far (the one described here). And the service is always friendly and fast.
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