Learned experts and members Mr. Makkar, Mr.Daksh have given valuable advice. Kindly follow it.
No notice can be issued to you.
You can sternly and plainly:
-snub the tele callers that you are under no obligation to take any call, message from Airtel and pass it on to the person of their choice. If the company has any issue company should contact their customer on their own and company should beg apology from you in writing for intimidating, coercing, threatening, harassing you or face the consequences. You can mention that you are contemplating to approach the women cell of the local police also in addition to the institutions of print and electronic media, NGO's, police, social and legal forums, consumer forums, courts of law, TRAI, government regulators and ministries, Divisional Commissioner etc. You should lodge a complaint with police commissioner and Divisional Commissioner and ask them to call local BM of the company, punish the company and supply you the complete details of the telephone number from which the call originated. If they do not act at once raise RTI application and you shall see the things moving in your favor, and the company begging apology in person thru local staff and at that time you may video record the proceedings and ask the police commissioner and Divisional Commissioner also to update minutes of the proceedings in their record and issue instructions to all companies in the city on the norms, laws, rules to be followed.
-snub the tele callers to stop calling you at once or you shall arrange a demonstration thru student union, councilor of your area, along with media etc, at the local RO of the company and shall force the BM to receive the complaint under acknowledgment and beg apology in writing.
Your friend should supply under acknowledgment a written representation to MD of the company and state his complaint and having failed with biased Nodal/appellate office of the company he is making a final representation to the company, and company shall have to bear the cost and consequences of all representations and complaint and grievances. If company has been deaf and dumb your friend should be bold. he should also lodge complaints against company with local BM, police etc.
Company can file a complaint at the circle office ( usually at state capital) and the summons if any are issued to customer ( not you) thru " pyada" of the court and as per the practice they also make calls that summons have been issued. Otherwise Pyada has to make 3 attempts to deliver the summons at the address and if summons are not delivered pyada, may approach Police Commissioner to help delivery of the summons, and SHO of the local area may be asked to deliver the summons. SHO can not question or investigate or arrest and shall only ask to take summons. However this has not been seen happening. Company does not shell out that kind of money which shall make all this happen. Nothing moves without money. All these phone calls etc are made to coerce the customer either to pay or lodge a consumer complaint at his cost. Company engages lawyer for cases in wholesale and subsidized rates and lawyer shall not spend more than he gets. Hence coercion by phone calls. Moreover customer cal always present his side and defaults of the company in person or thru his lawyer. If your friend receives a legal notice from lawyer of the company, your friend may reply and mention that he has tried but company has engaged into willful and intentional default and he shall be constrained to initiate civil and criminal proceedings in a lawful manner at their cost and consequences.
If your friend has faced harassment he can lodge a consumer complaint with local forum.
Kindly post the details in the forum as it shall be useful and helpful for many who visit the forum.