There is no standard procedure to revoke vakalat. You can feel free to write whatever you want as long as it conveys your intention.
A formal application is usually not required, unless you are engaged in a serious dispute with your lawyer.
Supreme Court requires a formal application. This is discussed in another thread. You may please check that thread.
Many High Courts also specified procedures to appear as party in person. Each High Court has given its own format and procedure.
Since you are not appearing in Supreme Court or High Court, any special format or procedure is not required.
A sample memo is given below. There is no standard format. You may feel free to make your own changes as per your situation. This is just a sample.
IN THE COURT OF THE SENIOR CIVIL JUDGE
AT CALCUTTA (change this to whatever your court may be)
O. S. NO. 123 OF 2024 (write your case number)
PPP and others . . . Plaintiffs
Versus
DDD and others . . . Defendants
WITHDRAWAL OF VAKALAT
I, ABCD, Plaintiff/Defendant No. 3 (write whatever is applicable to you) in the above suit, do hereby withdraw my vakalat granted to Mr. Purnendu Bhattacharya (write your advocate's name), Advocate, Esplanade, Kolkata, in the above matter and discharge him as an Advocate representing me in the above matter. He will no longer act as a Counsel for me in the above matter and he will not appear for me in the above matter or conduct or prosecute or defend the same or any proceedings that may be taken in respect of any application connected with the same or any decree or order passed therein. He is not authorized to do anything on my behalf.
(your signature here)
ABCD
Plaintiff/Defendant No. 3
Print the above on one side of the page. On the other side, type and print the usual docket.
You can also get it notarised. It depends on your judge in your court. Usually it is not necessary.
Get the endorsement from your present lawyer, --- I consent for withdrawal of vakalat. He can also write --- No objection for withdrawal of vakalat. Let him write it at the bottom on this side of the page or somewhere in the middle on the back side (docket side).
If your lawyer refuses to give his consent, you can still file the above without his consent. Consent of advocate is not necessary. But it is good to have it. Less headache for everybody.
You had already sent a notice. That is an extreme scenario. Usually I do not recomment it. But you are the best person to judge your situation. You can mention that you had already sent a notice. I would prefer not to mention that. You have to think and decide.
The following is optional. It is a memo of appearance.
IN THE COURT OF THE SENIOR CIVIL JUDGE
AT CALCUTTA (change this to whatever your court may be)
O. S. NO. 123 OF 2024 (write your case number)
PPP and others . . . Plaintiffs
Versus
DDD and others . . . Defendants
MEMO OF APPEARANCE
I, ABCD, Plaintiff/Defendant No. 3 (write whatever is applicable to you) in the above suit, have already filed withdrawal of vakalat granted to Mr. Purnendu Bhattacharya (write your advocate name or you can also avoid writing your advocate name - omit granted to Mr.) in the above matter.
Please note my appearance as Party in Person for myself, Plaintiff/Defendant No. 3 (write whatever is applicable to you) in the above matter.
(your signature here)
ABCD
Plaintiff/Defendant No. 3
The memo of appearance is optional. You can file it along with withdrawal of vakalat. Or, you can file it later in a subsequent hearing, after the judge has seen your withdrawal of vakalat.
Keep in mind that there is no standard procedure. It depends on your judge and court. He may insist on something else.Some judges don't care as long as your intention is clear to them.