Now how can we uniquely get 29 and 26

For 29: 5+7+8+9 = 29

For 26:
5+6+7+8 = 26
4+5+8+9 = 26
4+6+7+9 = 26

As per statement 4 Bihari gave the highest rating points in Packaging, and Chirag gave the highest rating points in Hygiene.

So Bihari gives Ravi a 9 in packaging which means the highest points in Hygiene can be 8 only as Chirag gives the highest points in Hygiene and he gives the same score in packaging too.

Also per statement 6 Atal’s rank based on Packaging is the same as that based on Hygiene. This is also true for Deepak, this means that Bihari will be second in Hygiene and thus gives 7 points