Can activation lock removed in Apple store

Yes. If you can prove original ownership to the satisfaction of Apple (in their absolute discretion), usually with the original invoice that clearly shows the device serial number, it has been known for assistance to be be forthcoming.

You should note that there is no guarantee that you will receive assistance, but anecdotal reports indicate that it has been known in limited circumstances.

As the original owner, you should be able to resolve an Activation Lock yourself...

If your device is Activation Locked, this help page will provide most of the information that you’ll need:

https://support.apple.com/en-us/HT201365

If you have forgotten your AppleID or associated password, these can be recovered here:

https://iforgot.apple.com

To recover your credentials, you’ll need access to one of the following:

• Your primary email address mailbox that corresponds with your AppleID
• Any of the secondary/recovery email addresses that should be configured for your AppleID account
• Any of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleID

Unless you AppleID account has not been fully/correctly configured, or has been seriously neglected, recovery of the AppleID and password should not be difficult.

More information about recovery of your AppleID:

https://support.apple.com/en-us/HT201354

More information about recovery of your AppleID password:

https://support.apple.com/en-us/HT201487

When you recover access to your credentials, you would be well advised to log-in to your AppleID account from a web browser - and verify/update any email addresses and trusted telephone numbers:

https://appleid.apple.com

I hope this insight and information proves to be helpful in resolving the problem.

Valid Purchase Bill means it's the original purchase receipt which shows the iPad Serial Number. A receipt from a private sale or from eBay or some other non-authorized seller is NOT a valid purchase receipt.

Your question has absolutely NOTHING to do with the subject in thread, but if your App Store is disabled, you need to contact iTunes Support per the directions here:

If you see a message that says 'Your account has been disabled in the App Store and iTunes'

Contact Apple Support for help.

If you see a message that says "Your account has been disabled in the App Store and iTunes," there might be a problem with the payment method that you have on file.

When you see the message, don't try to edit any of your account information. Instead, contact Apple Support for help.

How do I remove the disabled status of Apple store ?