I haven't and am so sorry to read this.
I went through extensive training 30 odd years ago about dealing with fragile materials and my instructors voice still resonates in my head every time I work on anything. "No sharp edges! Especially inside corners." He would fail us if he even saw a blade mark along the edge. Just another potential of a crack.
Hopefully you have pictures of the cut-out. If not, do so as you have it repaired. You may have recourse if your state so allows.
Please also understand that FR reserves the right of notification of any action being brought upon them or they have the right to refuse repair/reimbursement. Learn your states warranty laws. I'm in a weird situation myself with mine and learning as I go.
Hope all works out for you!