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Zosia_P
I'm assuming that the seatpin is alloy? If it is then heating won't work, the alloy will expand much more than the steel frame. A method I've used successfully in the past is to immerse the seatpin and top of the seat tube in a bucket of crushed ice for half an hour or so, clamp it up nice and tight in a vice, wrap a rag soaked in boiling water around the seat tube (use gloves!) and twist immediately. If it doesn't move then repeat. If you can get some movement, no matter how small, you are winning and the pin will, eventually come out.