Updating: With sincere apologies I take back my words, it was not the case of photoshopped image but a blunder done by Airtel DTH Team.
According to Airtel CC, they have started this offer from Today i.e. 6th Oct 2014 but since last three days, channel no. 167 (Offer4U channel) was randomly showing two different ads. One Advertisement was showing the HBO combo channels for Rs. 30 & another advertisement on the same channel was showing it for Rs 79. Airtel has rectified this error now. Still when I opted for this combo, Rs. 79 were deducted from my account and not Rs. 30/- . This was exactly the case with many customers yesterday and Day before Yesterday. After writing an email to them and complaining to their Nodal office, Rs. 49 were reversed back to my account.