Consumer Redressal

2-3 yrs ago i was using tata docomo prepaid sim happily. (9029788336) 1 yr ago company introduce me new plan and converted in postpaid. but didn\'t bill me as per committed tariff.(on tariff confirmation call i was not agree for said tariff but their executive confirm it and tell me that \" you will get waiver for excess bill\" for that i raised complaint to costumer care,they gave me waiver in 1st month and again charge me excess bill, i raise again complaint to customer care, online complaint also at (listen@tatadocomo, & alpalate@tatadocomo)but they didn\'t reply favorably or sumtime no reply was given. & force to convince me for bill payment. after that they disconnect my no also. and now irritating me by asking for bill payment. they call me and once their recovery executive uses abusive words to me. they were calling to my family members also for recovery. now recently i have received 2 times advocate notices. plz help.