This sort of situation occurs with activation lock. Almost no one having activation lock is able to remove it without Apple supports help. This help can be obtained whether you purchased you device new or second hand. You will need to have your, or access to the original owner's, purchase receipt for the device from an authorized Apple seller with the device’s serial number on it. If you have access to the receipt, then you, or the original purchaser, may be able to persuade Apple support to remove the activation lock. Use the support options below. Alternatively, if an Apple Store is open in your area, they can go there to deal with the problem.In this case, they can make a genius-bar appointment (https://www.apple.com/retail/geniusbar/) if desired.
If none of the above work, then the device is useless to you.
Apple ID Support https://support.apple.com/apple-id
Apple Support Twitter https://twitter.com/AppleSupport There may be a wait.
Apple ID account security for country-specific andregion-specific help https://support.apple.com/en-us/HT204169
Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.