Aircel Prepaid — network

Address:

Andhra Pradesh

my name is Aditya i am using aircel prepaid pocket internet with a recharge of 98rs.
i am experiencing a lot of troubles due to low speed and no network coverage .even though i am using opera and Google chrome browsers. if any one calls the customer care they will just try to get rid of the call .and there is no response to my 15(approx.) complaint from a year. so aircel network please solve my problem or just tell me how to disconnect aircel manually through my mobile.