@Shubham Pareek Sorry for the inconvenience caused to you!
From the details shared in the original post, I understand that you requested for more credits for your start up program and post verification the upgrade did not happen.
We worked with the concerned program team internally to expedite your request. As per case ID - 2502230040001210 your account has been activated and extension given. You may confirm the same by "Accepting answer" and "Up-voting" the post.
If problem persist, please raise a level up request for more credits. Reference link - https://learn.microsoft.com/en-us/microsoft-for-startups/get-more-benefits-faq
If the response helped, do "Accept Answer" and up-vote it