Supreme Court has banned telemarketing and as far back as I remember Bharti Cellular was fined for the same. However most of the cellular operators are continuing this practice in the disguise of value added service. This calls does not stop even if the customer registers do not disturb with operators. Worst part is the telemarketers explain you a different scheme, activate a different one and charge you for something else in the services. The best way to get rid of this nuisance is to forward complains of these telecallers to trai left right and centre. Unless you do this, you sure are gonna taken for a ride.