How do i lodge a complaint to a service provider who duped me?

Take your phone to Mobile Service Provider's Cutomer Attention

I would suggest phoning or emailing your DSTV provider. Any company that provides a public service should have clear contact info

Too late. If you were using internet on it and free anti virus apps then there was a hope of locating the device. You could lock the phone or delete its data or even get its approximate location. But not now.
The only hope you have is by lodging a police complaint. The police, based on your complaint can ask the service providers to locate this phone. Try it.

Report with your IMEI code to the service provider or it is best to lodge a complaint - FIR - to the CYBER CELL of the Police Dept. that is in your area.
You will need to produce doccuments to prove your ownership so that the phone be traced.

Once a problem like this occurs it is simcard (phone line) problem and not the phone.Check your simcard certificate you will the puk number or better still call customer care line of your service provider to lodge the complaint,they'll unlock it

You can easily make a complaint to the Police station closer to your place. Secondly you can call your service provider and lodge a complaint for barring this number.
If the caller keeps on disturbing make an official police complaint and the Cyber cell will trace the person .

you better update your phone software at your nearest LG service Care center. Even though the problem persists then it your service providers problem or the senders service provider problem. So please conctact your service providers toll free no & lodge a complaint.

Prateek,
The only way you can trace the phone in India is to lodge a complaint with the police and ask them to tell the service provider to trace the phone. You will have to give the IMEI number along with the complaint. And best would be if you contact the helpline of your service provider firstly to block the number and secondly to as them the procedure to trace it or whatever they suggest. Since it is a legal matter, the police has to come into the picture.

Vishal, No you cant get it back, but you can make it such that even the finder/thief can not use it. Go to the police to lodge a complaint, which in any case you have to to get the same number allotted to you again. In that complaint you must mention the IMEI number (you can get it from your receipt from the dealer or from the dealer's copy) and ask the police to tell the service provider to block that IMEI number. If you cant use your phone why should someone else use it. Your request to the service provider will not be heard because such is the law. onlt police can get it blocked.

And your solution to this problem is to post on a website rather than to complain to the company.