Cannot verify GBP account because we don't have access to the phone or email.

[narinz]

Hello everyone! We recently claimed a profile that was created by someone with whom the client doesn't have contact. We requested access, and because the owner didn't respond in 3 days, we were able to claim it. But unfortunately, the client doesn't have access to the phone number or the email; therefore, we are not able to verify the account. There is also no other option for verification. We tried to reach out to Google support, but we couldn't get any help. Does anyone have any experience similar to this?