Hi RaviRanjan8,
Thank you for reaching out Microsoft Community. We're sorry to know that the charging port of your Surface device is already damaged.
In this case, what I can highly recommend is to contact our Microsoft Surface Support so you'll get further assistance in getting a replacement for this unit. They're the one who can further assist you and address your concern on how much will you cover just to take care of this issue. Please visit this link for the number>>https://support.microsoft.com/en-us/help/4051701/global-customer-service-phone-numbers.
If this addresses your concern, feel free to mark this post as an answer. Otherwise, don't hesitate to respond to this thread if there's anything else that needs to be addressed.
Kind Regards,
Crest_Z