Les Schwab siped my tires w/o asking!

Had four Open Range AT/Plus tires installed on Wednesday while traveling out of town & just noticed on the receipt that they siped them - an extra $80 cost and something I did not request.

Plus charged for a TPMS rebuild kit and I have a tire icon lit up on the dash.

Siping can void the warranty according to the manufacturer.

I plan on going to my local Les Schwab to sort this out on Monday. Has anyone had a similar experience?

On the plus side, the tires drive beautifully!