So my friend and I were replacing the brake lines and master cylinder on my 190D today. I realized I didn't have any line wrenches and measured that I needed a 11mm for the brake line. Went to Autozone and they did not have an 11mm so we headed over to O'Reilly's and they had the wrench but in a 3 wrench set for an exorbitant $20 but I bought it because I wanted to use the correct tool and figured I would probably use it again if I needed to do the lines on my brother's 300SD and they had a lifetime warranty. We get home, start on the lines and immediately the 11mm wrench slips on the front driver's line and rounds off the fitting. I find my caliper and measure the wrench: 11.6mm.

So my friend and I take the set of wrenches and caliper back over to O'Reilly's and try to get a refund for them selling defective tools. The guy that rang me up when I bought them saw me as he entered the store after doing something on someone's car, said in a raised voice that I cannot return used tools (was not told this before, nor is it on the receipt), so I asked him what I should do with them, he responded, "Keep them! You bought them!" and gave us a look like we better get out of there before something happened so at that point we left the store never to return again especially after being yelled at by a very rude employee. I work in a job where customer service skills are needed and I would never be rude to a customer nor ignore their concerns even if they were being completely unreasonable, which I was not. The company would also refund for products or services it provided if the customer had legitimate concern over its quality.

So we went and found an 11mm open end wrench that was actually 11mm and tried to take the line off but no use, the fitting was too rounded for it to grip.

I measured the rest of the wrenches and this is what I got:
Marked 10mm, measured 10.7mm
Marked 13mm, measured 13.8mm
Marked 12mm, measured 12.5mm
Marked 15mm, measured 15.5mm
Marked 17mm, measured 17.5mm
None of these wrenches would work for whatever I would use them for.

I now need to have the brake hard line replaced, which probably means having the car towed to the dealer. Factor in parts and labor as well and this will probably not be cheap and of course I want a refund for the wrenches. I will be writing O'Reilly's corporate as well as the tool manufacturer, will include have copies of receipt, pictures of the damage, estimates for the repair, the measurements of the wrenches, and of course will include statements by my friend and I on how poorly the O'Reilly's employee treated us in front of other customers. Any other ideas on what I should do?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.