Tata Teleservices Pvt Ltd — TTSL Hired Thieves

I got a phone call from a lady (her no. [protected]) today at 11 AM telling that she is calling from High Court, New Delhi and there is a case registered in my name regarding forgery, transactional fraud, cheating, high money laundering and cheque bounce. And I was supposed to be in the court today else I'll be prosecuted and sent to jail by High Court. I was shocked and scared on knowing all this. I asked her that I didn't get any notice on anything on which she said, notice was sent to you but was returned due to unavailability. I quickly asked her to tell me as who has registered the case on me, on which she said she cannot tell me the other party name as the file is sealed but can give you the advocate number and the case file number. I asked for the details and she told me that she will call me 20 minutes later till she will hold the case file to pass over to the Magistrate.

She gave me the details:
Name: High Court Adv. Arjun Singh / Nisha Rathore
Mobile No. : [protected]
Case No. : 104/13

I called on the number given and below is the conversation which happened between him and myself.

Arjun Singh: Hello
Me: Hello, sir, I want to know the details of a case 104/13.
Arjun Singh: Why are you asking the details on phone from me, you should be present here in court today.
Me: On what basis sir, I haven't even received any notice yet. And I even don't know what is the case and who did it on me?
Arjun Singh: Notice must have been sent to you but you would have ignored and now it will be very difficult for you. Let me check the case for you. Please tell me the case number again.
Me: Sir, its 104/13.
Arjun Singh: 104/13, ok let me check it in the system. Oh! it is a case of fraud with TTSL.
Me: Sir, TTSL? Who's that?
Arjun Singh: You don't know TTSL? Tata Teleservices Ltd. You used a phone of TTSL 5 years back and didn't pay Rs. 856. It is still pending and I'm their legal counsel and on their behalf, I've filled these cases on you.
Me: I have no pending payments to TTSL as far as I know.
Arjun Singh: If you have receipts, you have to produce them in court today else we might have to take strict action on you.
Me: I cannot come to New Delhi High Court today as I'm in Amritsar right now.
Arjun Singh: No problem, you can deposit Rs. 5000 in our account and we will take a date on your behalf and close the case.
Me: Send me the notice and I'll revert back with my lawyer. And till then stop making fool of innocent people. You'll get punished for doing these kinds of misleading acts.

And I disconnected. Again he called up.

Arjun Singh: Saale fraud, do kori ke insaan, paise hote nahi tumhare pass, dekh kaise teri marta hoo?
Me: Notice bhej and don't call again, phir main bhi dekh loonga .

I disconnected. And since then he's continuously called me till next four hours, I got around 50 calls on my number, few I picked on which he was continually abusing me. I got so much depressed and scared that I cannot do anything whole day of the scare.

I want to take strict legal action, please advise.