How to get refund if there is no written agreement

I had finalised on a commercial property and paid a deposit of one lac through online to the shop owner,within 7 days I had to withdrawn it cz of personal serious promblem,however no agreement or mou either ws signed by both parties,owner however agreed to refund whole amount ,its been over a month now he hasn't refunded the amount M i entitled for full refund? Or partial refund? Pl note nothing was discussed verbally or in any written form for any deduction incase of withdrawal.