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Hey
@davidjohm, not sure what u mean by kottayam "service centre". Please call airtel digital tv customer care on 12150 (from any airtel mobile) or Call 0484-4448080 for Kerala state. If you have already done this and even they are asking you to pay Rs 150 extra, then I think you have no option. Please do ask for bill/receipt of the payment done by you when airtel digital tv technician comes to install at your place. If they are not giving you any bill, you may tweet to @airtelindia and they will refund the amount to your airtel digital tv account.
There are a lot of so-called "authorized dealers" who are demanding more from customers. If you do your booking from Customer Care, you wont have to pay anything extra. Cheers!
Source of Customer Care Nos.:
airtel Customer Care Number | DTH Customer Support