Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
You need to start by calling the local taxi bureau in the city where the taxi is licensed. The taxi bureau has strict rules on fees that cabs can charge passengers and that rates must be posted and/or told to customers before the trip. If the taxi did not abide by those laws they can be fined and have their license taken as well. In addition, if they deviated from the posted fares you can sue in small claims
court to recover the difference he made you pay.
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This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.