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@Oswald
^ This. Cut the screw at the slot in the seat clamp. If you're lucky once the pre- load has been relieved from the screw you can wiggle the threaded part out and will only have to replace the screw.
I am a but surprised by this as you used a torque wrench .. Assuming that's an original Thomson screw they claim to use 12.8 grade screws and recommend an install torque of 2.8Nm for the collar so there should be plenty of safety margin .. around a factor of 4 I think. Is the drive bit you are using with the torque wrench nice a 'sharp' tight fit and not rounded or damaged so it can 'slip'? Obvious question is calibration of the wrench ..