Overcharged bill, Harassment and Fraud

Dear Sir/Maam,
I want to complain about the continuous harassment and fraudulant behaviors by Tata docomo. Inspite of following up regularly and proactively, I have received nothing but threats and harassment from them regarding an inflated bill. Here is a brief summary:
1. On a trip for 4 days in roaming, I received a bill amounting as huge as 6500. Please notice that I did not consume more than 1 GB in entire roaming per their bill.

2. I continuously called thhem to clarify the bill to which the call center confirmed that the bill amount doesnt show the same in backend and it was probably a wrong bill I recd by mistake
3. I asked them to rectify and next time I met some other chap on call center and he confirmed this bill was correct and I had no option but to pay lest the no will be barred
4. I was outraged and asked them to go ahead and I’ll need to clarify the bill as I was not convinced on usage

5. Several back and forth calls were made to clarify the bill and I sent regular updates to [email protected] to tell them about what was happening and how dissatisfied I was
6. Later a person who called himself Maninder and gave me his no as 9217001332 visited me at home, introduced himself as a rep from tata collections team studied the bill with me and accepted it all as a genuine billing issue. He asked me to make a cheque payment of 1900 and the rest 5400 be waived off as it was a clear case of overcharge and billing mistake
7. The cheque payment reflected in the system the next day, however there was no bill adjustment made. THe whole series of calls to ask me for payment started all over again and harassed me of legal action.
8. When I told them about Maninder, they said you gave us a wrong no and the person cannot be traced. If this person cannot be traced then how did he have tata docomo payment receipt that he gave me, how did he carry the id card and how come the cheque he took from me reflected in tata docomo account? And if he was genuinely their collections guy who provided me with incorrect details and fraudulant commitment, who’s responsibility is it to reach him? Mine? Shameful as it sounds but the call center guy tells me to find this man or make the payment.

9. I refused to do it. Tata further sent me a written letter to reach out to ms Tanisha Gupta at no 9958826958 for any issues or make the payment. Although I was pissed to the core, I still called ms Tanisha. Rude to the core and boundlessly unprofessional, this female banged the phone on my face each time I called her without even caring to know who I was and what problems I had

This episode of harassment and torture has not stopped till date. I need a quick resolution on this and I’ll prob have to get an FIR regd against Maninder for fraud and cheating. Please help.