1. Seek a consultation with legal counsel if you believe you have lost money and the amount of money lost makes it worth the time to pursue a complaint with the Texas Real Estate Commission and possible reimbursement from the real estate recovery trust account. It will not be a quick process though.
2. It would be foolish to sign a new contract with the same brokerage.
3. Make sure every phone call with your brokerage is recorded (two party calls only or make notification of recordings if more than two parties involved) and every email and text is saved. Anything in writing or recorded is much harder to dispute. With your next brokerage, make sure you start this process with the very first conversation...record every communication and save every email / text from day one.
4. Due lots of due diligence before hiring your next brokerage. There are too many D/D items to go into here but you can always start with the Texas Real Estate Commission website and search for prior actions taken by TREC against your current or future brokerage. Then formulate your questionnaire.