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Assuming your block is like all the others I've seen:
There should be a disc just outside the damaged slots which the removing tool would have fitted into. The disc is often stamped "unscrew" with an arrow pointing clockwise since it normally has a lefthand thread. This disc is the outer cone of the freewheel bearing and should have two small holes into which you can insert a punch or the edge of a chisel to unscrew the disc. Once this is off the outer part of the block with the sprockets comes away revealing the centre which can be removed in a vice.
And if you can re-assemble it afterwards you're a cleverer person than I am.
clubman
I have a spare period 3 speed so no problems. How do I go about dismantling a rear block?