What is the interest rate on the actual Note from the closing? That is the most important document, as it is the promise to repay, and is what your loan is based off of. If that one is correct, and the Closing Disclosure accidentally showed a lower rate, then agree to fix it and move on.
It’s not a great look for the bank at all, but you have to remember that humans are the ones drawing up these documents, and errors happen. I wouldn’t blame you at all for moving your banking relationship elsewhere, but I don’t think you have much recourse here.