I do not think that Gautam has backstabbed Puneet.
1. It seems like all the housemates decided to make that wish of freeing Puneet from the jail, because all of them apart from Renee and Upen.
2. Has Gautam asked anything for himself? Has he asked for protein shakes, or makeup?
3. Was Puneet fair with Gautam when he was doing the captaincy task? In fact, Puneet and Pritam backstabed him. this is somehow tit for tat or Karma b*tch!
4. While the whole of the housemates were busy discussing why Gautam did not make any wish, he was the only one helping Puneet doing his packing. Where were Pritam and Praneet that time?
At the end of day, it seems that the HMs' days cannot surpass without discussing about why, what when Gautam!