Vodafone cheating bill

i took a Vodafone CGU postpaid sim .Last month they have gave 1350 as bill and in that for calls they charged 450 something and for net usage 625rs for a nokia basic set mobile.I really dono how come Vodafone sim alone can make they user to use net in basic set mobile also.Really a cheating job they do.I really cant understand y a reputed company needs to earn like this!!!!!!!!!!!!!!!1