India Post — my bike rc book are missing by india post

Address:

109,krishna row house,vi-1, pasodara ,kamrej surat, Surat, Gujarat, 394185

After waiting for 1year and 4 months, didn't receive the rc book, so dealer told to contact rto office surat, but when i do enquiry over rto office, the officer told that it had already been delivered so contact post office, but the post office (Varachha post office 395006, surat) officier is not giving any status regarding my rc book, just telling it has been returned without specifying any reason.

Please help now how should i proceed further.

As i don't want to have duplicate copy since it is not missing from my side. How will i receive my original copy.