You can sue them in Small Claims Court - alleging fraud, misrepresentation, elder abuse among other things. Small claims court covers disputes up to a certain dollar amount and does not involve you hiring an attorney. Good Luck!
You can do small claims court if you feel the time and energy is worth the money and moral principal.
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Based upon the information you are providing I do not think you will be successful in court, small claims or otherwise. Storage company contracts commonly include a series of extra fees and legal recourse for the storage company when the renter does not pay on time. Unfortunately that is the nature of their business and there is nothing wrong with it. If there is something in the contract that is deceptive or legally prohibited you may have a case but if you are not able to specify a claim you will be wasting time and more money. Further, if you do have a viable claim, what money have you lost (you mentioned paying an extra $100 fee) to the company. You will have to be able to prove that you were damaged. Often the small claims clerks office can be helpful and you may want to contact the Bronx Bar association for some free advice and ask if someone can review the contract with you.
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If you go to small claims, it must be to seek a monetary judgment. I suggest that you obtain some pro bono (free) services from inquiries through the local county bar association, since you seem to have limited financial resources.
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