India Post — Lost of letter which is sent by a normal body

Address: Patna, Bihar, 800001

Website: www.indiapost.com.in

Sir,
I Sanjay Kumar send a letter by normal post from Ghorpuri post office Pune(MH) to Shri Kamta pandit new yarpur, janta road, Patna Bihar, pin - 800001.in the month of 08 Feb 2017. Hence till date my letter not received. The primary post office said he's not responsible for this. Then who is responsible. Is there using a normal post service is a crime and gov paid him to relax.