that happens that often for you?
Remember these things:
the customer is always right, when we want them to be right. ---Meaning, we know some customers try and pull the wool over our eyes so we act accordingly.
dont raise your voice. ---raising your voice will cause them to raise their voice, thus turning a conversation into a heated argument. Raising your voice we never solve a problem.
Repeat your statement. ---you may need to repeat yourself more than once, when you do, say exactly the same way. Saying it differently or adding other things to your statement makes the person receiving it confused and frustrated.
Tell facts not stories. --- dont embelish, dont lie, dont tell them anything that isnt true because when they find out your really in hot water with them.
Be confident -- People have the ability to pick up the fact you dont know shit about what your saying, so dont say it unless you know what your talking about. If you dont know, tell them you dont know and then tell them you will find out.
Be polite. --- Always be polite. Some old schoolers may differ from this but we didnt have the internet back then either.
Put yourself in their shoes. -- they dont understands cars and the mechanics of those cars, you do, so its easy for you to get it that tires have nothing to do with the engine overheating, but THEY DONT, so understand that your are smarter than them in this field and teach them but dont teach them by being disrespectful or demeaning or treat them as they are dumb. Treat them better than you would treat yourself.
Lastly, do you really need to be arguing about this? If they are arguing about a few dollars, DONT lose a customer over it.