I use to get these type of calls every morning sharp 9-10 am. Fed up i once told them to not call me again. The rep repeated again "so you dont want to receive these type of calls again" .... like asking for confirmation. i said yes please don't again and he said you won't receive these types of call again & disconnected.
I thought may be he was joking but surprise surprise .... never got those calls again.
So go with tata sky slogan "puchne me kya jaata" - "why not better ask"
Wish all cos act like this.