Olx India — Holdback amount of sold car not yet transferred even after owner name transfer

I have sold my car Hyundai i10 on OLX for 163720 rupees. I receive 149121 rupees immediately after OLX representative, picked up my car. A certain amount was deducted by OLX as their commission, which was mention at the time of negotiating the price and and hold back amount of rupees ₹10, 000 was kept by OLX and they mention this amount will be transferred once owner name transfer procedure is completed at RTO. on 25th April 2024, I visited Barasat RTO in West Bengal to complete all relevant onwer transfer procedure and signed all relevant documents in front of RTO official. Even after months later, I have tried to asked them about my holdback amount but there is no proper communication from OLX employees for my hold back amount .
I have the possession receipt from OLX, which mentioned about the ₹10, 000 holdback. Please look into this matter