Activation problem
I submitted my phone 6s plus to Sharaf dg Abu Dhabi who is authorised apple service producer. After 2 days they returned the phone saying they are unable to turn off find my phone. I tried to reset the phone, and realised that Apple ID was changed to a new one which is unknown to me. I contacted apple and they wanted the proof of ownership to resolve the issue. After submitting it, they assured that it will be solved in three days. Fourth day I.e. I contacted apple who says the ownership is established and it will be resolved within 10 days. Is it reasonable. What is the justification for taking another 10 days?
iPhone 6s Plus, iOS 14