Mobikwik — wallet debit against bank transfer recovery by mobikwik

I applied for credit boost on mobikwik and got 10000 credit but as soon as i got it my amount was debited by 1000 rs saying that wallet debit against bank transfer recovery and when i asked customer care they said that it was recovered for incorrect credit of successful transaction dated 18/02/2017 i mean on that day my wallet was debited and i got the same amount in my bank how can they deduct money after 18 months this is cheating i also told them to cross check my transaction history and verify whether the amount from my wallet was debited or not