Airtel — bad service and complaint redressal

Hi,
Recently I ported from Vodafone to Airtel. I have a serious complaint that I have been discussing with Airtel's customer service representatives over the phone since almost a month, and at this point I have given up any faith whatsoever in them. Airtel has done a great job training them in fooling people, wasting customers' time and efforts, giving made up stories and deadlines, what not. A complete circus ran by con artists.
I am very disappointed and unable to understand what type of operation is Airtel running. Their people were pestering me since last one year for porting my number to Airtel. Last month I couldn't have it anymore and decided to opt for airtel (my biggest mistake). Their guy delivered me the new SIM card around 27th Nov'17 and completed the documentation there only. SIM got activated around 5th Dec'17. Since then, I have not been able to use internet service. I have called up customer care numerous times, just to hear from them a deadline of 24 hours which was never met.
I had a conversation from most junior to most senior staff member present there and they used to tell me different story every time. I dont know for what Godforsaken reason, one of their customer care representative told me that a wrong SIM card has been delivered to me, after which a strange guy called me and said "OMG sir, I cant believe this, your SIM shouldn't have been activeated, this is unbelievable". Their people have no sense of professionalism. I have used services of a couple of companies and this is by far the worst that I have came across.
Since last couple of weeks, I am being told that there is a technical error on their behalf due to which my SIM is partially activated and still pending for complete activation, which will be resolved (guess what, ironically in 24 hours).
When out of frustration I asked one of their customer care representative to guide me to the process of porting back to Vodafone, she told me that I just cant do it before three months because of some TRAI rule! Are all rules applicable to customers while they get to act like outlaws? This is an utter harassment and should be dealt with a proper legal action.

I only demand that this issue should be resolved asap.

And on a closing note, I'd like to say 'I AM NEVER GOING TO RECOMMEND AIRTEL TO ANYONE. I DONT WANT PEOPLE I CARE ABOUT TO SUFFER LIKE I DID. I WOULD PERSONALLY MAKE SURE PEOPLE AROUND ME PORT TO DIFFERENT SERVICE PROVIDERS'

This is Airtel's first impression, and its going to be hard to change for sure.