Airtel Bharti Company - unethical imposing of postpaid schemes

i went to the airtel store since my numbers outing validity expired due lack of recharges for last few months. they people asked me, that there is just one option , if you want to continue with ur current number that is switch your number to postpaid for minimum * bill cycles, which would cost me around **** with minimum usage plan. But the actual solution was to just rechage with a minimum of ** rupees per month. So are these airtel store people sitting there to just make fools of genuine customers. i am very much disappointed with this. i will port my no. to some network.