Make My Trip India — Refund of amount

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I had booked air ticket from chennai to kathmandu durimg april 20 and return thruugh make my trip in indogo airlines {ref in1b[protected] pnr rgs5nc and yw7sgk for rs 43524 .Due to total lockdown and pandemic the travel was cancelled and as per sc and govt rules airfare has to be refunded, but same was not done in spite of my repeated follow ip through given e- mails which was returned.
Suddenly i got refund of rs 20554 and the balane yet to be refunded.