the order has been sent, the buyer has not confirmed until the duration of my work is up
No worries, It will be mark auto completed after 3 days, if the buyer not response in the time.
Whats the problem? contact them and ask if everything was good or not.
As long as you’re sure you’ve done your job correctly, no worries.
I think the problem is the usual thing, what I send is a revised result based on the reference given by the buyer