I find it difficult to believe that at 6' a 58cm bike can't be made to fit you.
Has the steerer tube been cut? You can raise the stem 4cm with spacers below the stem, if you or someone else hasn't already cut the steerer.
You can raise the bars a number of centimeters by flipping the stem up, and going to a steeper angled stem.
So as stated above pics would be helpful.
My bet is using the allowable amount of spacers, and a stem with the right rise, that frame can easily be made to fit you.
FWIW, I'm 6'1" and have bikes that all fit me, with top tubes from 56cm to 57.5cm, which are al smaller than your bike.
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You could get lost and die.
You could hit a tree and die.
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