They don’t ‘have’ to answer your questions unless submitted as FoI and not subject to an exemption. Whilst a poor state of affairs - thems the rules if the PC want to shrink away from embracing your issues.
They can declare you as vexatious if your actions are deemed to have triggered that course of action according to their policy. It is also a poor state of affairs when a PC invariably expend more energy trying to shield themselves from answering questions and embracing what might be perceived as ‘difficult’ questions than they do just answering the questions.
They absolutely CANNOT ‘ban’ you from attending a PC meeting which is open to the public.
You must ensure you don’t provide any opportunity for them to criticise you. Understand, and abide by, the standing orders for a meeting.
The chair can ask a Cllr or member of the public to amend unruly or disruptive behaviour in the first instance, they can then call a vote that a Cllr May no longer be heard from and they can adjourn a meeting for disruptive behaviour.
It is imperative that you do not provide them the opportunity to criticise you. Other than that, just turn up to the next meeting and abide by standard procedure.
They can’t ‘put’ you out, all they can do is abandon the meeting and (so long as you have abided by due process) that is entirely voluntary and inappropriate action on THIER part.
Stick with it!