Greetings,
Not sure what the extent of the "damage" is, but the lens itself can be replaced used for $100 and new for $250.
I'm inclined to tell you to replace it with a used copy.
The EF 75-300 is a low quality, entry level optic. You'd be much better off with the EF 70-300 USM II. It can be had used as well.
~Rick
Bay Area - CA
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