Based on the context provided, NOC in this context of your bar council complaint likely refers to a No Objection Certificate.
Generally speaking, a No Objection Certificate is a document that a party issues to indicate that they are in favour of a specific course of action. The lawyer may be asking for your consent to leave the case concerning your bar council complaint.
Here's a possibility of what happened
The police have contacted the lawyer regarding your complaint.
The lawyer is now requesting a no objection certificate (NOC), which may indicate that they wish to step down from your representation.
It's crucial to remember that this is only one interpretation that may be made. The particular definition of NOC in your case may vary according to the specifics of your lawsuit and the goals of the attorney.
This is what you ought to do:
Never sign anything unless you are completely aware of its consequences.
To find out more about the lawyer's conduct and the status of your complaint, you might want to get in touch with the bar council.
These actions will help you make sure the choices you make are well-informed.