Certain promises by an employer create a contractual relationship such as promises to pay you and compensate you an invoice. But internal promises of I'll agree to train you are not trained you are may not be rising to the level of an enforceable contract
The hiring of a lawyer is an important decision and one you should not make just upon reading something. While I may generally provide some helpful information and an answer to your question, this is not meant to be direct legal advice to you. If you wish legal advice, many attorneys offer free consultations on certain legal issues. If you wish to be certain about how best to proceed to protect your legal interests then I encourage you to contact the lawyer with experience in the same area of law
Most employee is our society are "at will". Therefore unless you are in an employee contract that states the terms you are describing, there probably is not much you can do besides find another job. Sorry that happened to you.