Zoom Car — excess km related

I took a maruthi swift from zoom car for 5 days. I paid 5000 rupees for 5 days and 3000 security deposit car had little damages after booking get closed next day i paid around 7000 +3000 security deposit that means 10000 for damage fee. After 21 days i received a message stating that you have to pay 28000 for excess km after few months later i received a call from zoom car stating that you have driven for 2000 km i told him i drove lesser than 500 km please verify he kept the call after 30 minutes he called me again told that you have drove the car for 1000 km and you have to pay around 9000 rupees i told it is not possible i am very sure it will not above 500 only mistake i have done i trusted zoom car didn't take the photo of the kilometres travelled. Please verify and let me know what can be done and tried reaching customer care but no numbers was reachable. Please help to resolve the issue.