HDFC Bank — Void Sale not reversed yet

Had made a transaction of Rs. 30, 000 with my ICICI debit card with a hospital. The hospital has then done a void sale on the same amount in order to cancel/refund my transaction. The amount is still not credited back to my icici bank account. Had a talk to ICICI and they say that the merchants Bank need to perform the reversal. Hence reaching out here. The merchants Bank is HDFC.
I need the money urgently to pay hospital bills and hence raising a complaint here.