India Post — Refund of wrong shipping charges

Website:

www.indiapost.gov.in

I had scheduled delivery of an item via speed post of India Post booked at chittranjan post office from Chitranjan to Mumbai on 15.10.2020 costing INR 94.40. The same item was delivered WRONGLY back to my home 5 days later on 20.10.2020. when I inquired about the incident in post office they argued with me that the item return back because it was refused delivery in Mumbai. I have to pay 94.40 again and nothing can be done etc. Company told me that this item never reached Mumbai( I have voice recordings). The India Post delivery person also confessed that item hadn't reached Mumbai instead it was their misunderstanding.
Therefore, I want full refund of the post charges INR 94.40 incurred as I am not liable to pay delivery charges for WRONG DELIVERY. This is India Post's Bluff.