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@4idan
I've done the seatpost saw out thing a couple of times. Each time it's come out easily once I had two cuts into the post.
I did the cuts about 1cm apart then as soon as I had removed that thin slice in between the remainder of the seatpost came out easily. This is because as the post corroded new oxides were formed between the frame and the post generating pressure which was squeezes it out against the frame. Once a small slice is removed the seatpost can flex and the pressure is released.
I used a long hacksaw blade and cut by hand. You can feel and hear when the blade touches the frame because it is a much harder metal to cut than the alu seatpost. I think i's the best way to avoid damage to the frame.
This job takes patience, good luck!