Indian Railway Catering & Tourism Corporation [IRCTC] — I didn't get my full refund amount

Address:

Chennai, Tamil Nadu, 600021

I have booked 5 passenger second seater tickets for 5 december 2019 for train: 16057 sapthagiri exp. Pnr: [protected]. Still all my tickets have been waitlisted, after chart preparation also. I have paid rs. 437.7. But i got a message only for rs. 100 amount have been initated for refund. For your kind information, i didnt modified or cancelled my tickets, then why i am not getting my full amount as refund. Kindly do the needful.