Vodafone — Changed of internet connection without any information

Address:

New Delhi, Delhi

To whom so ever its may concern
sir/madam
It is stated that I have a vodafone connection my number is [protected] I am using CUG 199 plan. I had a 2g internet connection but after I change my sim card in month of may 2014 I got a message from vodafone for free 3g internet free connection for two month that i dont accept it.I use my internet that i use before.but when i checked my unbilled ammount that is above six thousand that is too much.I rushed to vodafone center sector 3 rohini they tolled me that my connection is 3g after hearing this i was shocked because i did not take 3g plan how this happend.They dont give any message for start of 3g plan and complition of 3g connection.I have to say u to deal my matter properly and give feedback.