Yes, you are at liberty to leave the broker. You are also free to make sufficient noise about it for them to take notice. What they actually want to avoid is bad publicity.
I'd rather you didn't let it go cold. That's what they are banking on.
They can't close the matter without you agreeing to. Open the SEBI original complaint that you filed, post an entry about the feedback. Mention that you were not given a recording of the meeting. Continue with it from time to time on various platforms. Make sure you post the facts only, not impressions and opinions.