That's such a shame .
Did you try in the evening , low light levels ?
The idea is to warm it up with a hairdryer ( next to the viv ) then offer immediately whilst it's WARM , if it doesn't strike , follow the same procedure , hairdryer for 20 seconds and offer immediately . If there is even a tongue flicker you keep rewarming and offering .
Sadly , theres no real point dangling for 10 minutes as it's gone COLD , you're just stressing the snake and getting your self all worked up and frustrated ...