Manually it' s hard work. You need to dig a trench around the stumps an then start to undermine them. Saw or axe through the major roots. As you have found a normal spade is not up to the job. You need something called a digging bar to cut through the remaining roots and lever out the stumps.
www.amazon.co.uk/Silverline-1700-mm-Digging-Bar/dp/B000T9R26W
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