Doh!
To be honest the bolts have obviously been overtightened and their response will be to that effect and that it's all your fault.
They will neither care nor believe the fact that they've been torqued up correctly each time so I wouldn't have thought that there was much point complaining about them.
Not wishing to cause trouble but, perhaps more importantly, why haven't you actually looked at them when they've been out before torquing them up? Stretching like that should be obvious with a glance.
Don't worry I've been there as well. I managed to snap a caliper bolt and a pinch bolt on my race CBR600 within ten minutes of my first ever wheel change. The rest of the bolts were between 6mm - 8mm longer than they should have been!
Out of interest how good a quality is your torque wrench?
I have a Draper one which is okay. Had the calipers off my race SV650 about a dozen times last year and had no signs of stretching the bolts.
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