Hi Manish Suman, I can sense how frustrating and stressful this situation must be for you losing access to an account especially when support feels unhelpful can make you feel powerless.
To fix this issue start by completing the Microsoft Account Recovery Form with your original email an alternate contact email and detailed information such as previous passwords, services used, billing details, and recent email subjects using a familiar device and location and submitting only once every 24 hours then secure all linked accounts by immediately changing passwords enabling two factor authentication and scanning your devices for malware or keyloggers.
Have you scanned your devices for malware or keyloggers since the hack?
Best regards
Lucky Charm