Now if you are not happy with that particular agent and you did sign an agency agreement then you can always ask for a different agent to be given to you since the buyer agency agreement is with the firm not the agent.
I would suggest you ask to speak with the Broker-in-Charge and then can help resolve this.
I hope this helps,
Real estate professionals PROFUSELY advise ALL buyers to have a real estate professional represetning them when buying a home. I'm sure you read and heard that message also. Now, when you've created a mess, you want to get advise from those same professionals whose guidance you ignored before.
YOUR actions caused this situation. Not the agents involved. Now, you have been advised to drag another agent into the mess who may also end up with NOTHING!
You need to resolve your differences with the original agent or have the agent you like better resolve it for you. If you are teachable, you will follow the instructions of the agent you choose.
DO NOT SECOND GUESS YOUR FAVORITE AGENT BY SOLICITING THE OPINIONS OF STRANGERS FROM THE INTERNET. You are repeating your mistake and the result will be more injured parties and you looking for someone to blame. Let the professionals resolve the mess you created. Keep your hands out of the process. When fixed, you would be well advised to follow the instruction of the professinal you selected to represent you.
Even if you did not sign a buyer brokers agreement which would mean the agent opening the open house was really dumb, you could have problems as the first agent could easily claim that thewy were the procuring cause.
The second agent whom you like should have explained all of this to you, if they didn't then trust me their not doing their job and are not someone you should be working with. You need to be careful or you're going to end up owing money to someone for no reason at all. You need to review what you signed and if you've any questions about it you should speak to either a real estate attorney (which you will need anyway to close the transaction) or find someone you trust who can explain things to you.
If you did not sign anything, and your offer was only verbal than you can hire anyone you like and I hope it goes alright for you. By your question, I know that you really need an experienced agent's help before you find yourself having even more problems.