Does look like you've mashed it, from those pictures there's nothing saying you need to replace the crankset or BB, likely just the left arm, if you can't do that you may get away with filing down the mashed bits carefully and getting that arm back on, but that's a bodge rather than a fix.
Does look like you've mashed it, from those pictures there's nothing saying you need to replace the crankset or BB, likely just the left arm, if you can't do that you may get away with filing down the mashed bits carefully and getting that arm back on, but that's a bodge rather than a fix.