If you would like to make a complaint about a company, go to Indocopi. If you need to report fraud, go to Dinicri. Please do not sign anything that you don't understand.
Make sure you get everything in writing and make copies of all documents. You might want to get a lawyer to help you.
One tip to remember is that speaking Spanish will help you greatly. You'll be treated differently than if you speak English all the time, it'll help you assimilate, and you'll be able to communicate easier. If you're looking to learn Spanish, check out Fluenz Spanish, Rosetta Stone, and Synergy Spanish.
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