We had very bad experience with our Hutch Pre paid mobile services.
1. Evenif you carry SIM card out side India and donot load in mobile, they put International roaming charges without even notifying you for two months.
2. Another bad experience was that they cut for undelivered SMSs, Even in mobile instrument it shows unsent and their terminal also shows undelivered, their executives are helpless to reply these quiries.
Above both problems cost me in total Rs.300/-. I don't no how to approach to TRAI. Please inform me about procedure. These will help lots of customers of all service providers.

S H Mehta

On first I agree.

For second, I used to believe that you will be charged even for undelivered messages as they are sent from your mobile. Delivered or not delivered does not matter. But I will confirm this tomorrow and shall tell you.

Also, you should contact personally some Zonal office, give a written application, get is signed by official their , have a photocopy with you. It is mentioned that now Telecom company should settle any dispute in maximum 7 days , if they fail then you can go to consumer court.

Also, read this circular by TRAI on 4th may :
http://www.trai.gov.in/trai/upload/Regulations/64/regulation4may07.pdf

btw..
here are the contact details fro TRAI (DELHI only)

Address     :     THE TELECOM REGULATORY AUTHORITY OF INDIA
      
          Mahanagar Doorsanchar Bhawan,
(next to Zakir Hussain College)
Jawaharlal Nehru Marg
(Old Minto Road)
      
          New Delhi : 110 002
 
 
Telephone No.    :    91-11-2321 1934
      
Fax No.    :    91-11-2321 3294
      
E-mail    :    trai@del2.vsnl.net.in

Just to mention..
On the basis of previous experience by various people, their email is never answered. Though they sometime pick up the call but they say that best method is to visit their office personally, they do not offer support on mail and phone.