Section 54 r w r 96A belated realisation - Reg. - Goods and Services Tax - GST

We had exported engineering services under LUT and invoiced the client for $25000/- in March 2024. After remitting $15000/- the client expressed inability to settle the balance amount of $10000/-. The same was written off in the books as bad debts and we dutifully remitted GST @18% with appropriate interest u/s. 50 as provided in Rule 96A through DRC-03 challan for the unsettled amount of $10000/- in October 2024. The said client had today wired the balance amount of $10000/- and we have secured the FIRC. The query is, can I claim refund of the amount remitted through DRC-03 or would it be appropriate to avail credit of the same in GSTR-3B in this month's return? Kindly clarify. Thanks