Not sure what you mean by Apple emblem was mistakenly believed.
Typically you cannot delete the App Store, especially on an iPhone 7 that is likely to be using iOS 15. There are 3 reasons why you might not see it though:
- It could be in your App Library and not on any of your Home screens. Swipe all the way to the left to get to the App Library and then Search for App Store.
- If there were Screen Time restrictions place on the iPhone 7, then access to the App Store would be hidden and you would need to enable it again at Screen Time in Settings.
- If the account is a member of a Family Sharing group, then it is the Organizer of that account that can restrict access to the App Store where it will not appear on the device.