Your state has a Lemon Law. Take it back to the dealer and inform them that the 4th visit constitutes the car as a lemon if they don't fix it right.

Maryland Attorney General

The Attorney General is the chief legal officer of the State. The Attorney General's Office has general charge, supervision and direction of the legal business of the State, acting as legal advisors and representatives of the major agencies, various boards, commissions, officials and...

www.marylandattorneygeneral.gov

 

Sounds like they are having a real fun time just shotgunning it rather than troubleshooting it. Replaced the fuse box???
Electrical troubleshooting is an exercise in 'divide and conquer'. You find out whether there's power heading back to the 'motor' that drives the latching mechanism. No? Look upstream. Yes? Look downstream. Divide again on whichever side you find at fault. It isn't rocket science.
Might recommend a dealer with a decent electrical/electronics tech in house. Doesn't sound like yours has one that even knows how to use a meter. Just be sure it's done on Kia's dime (assuming you have some of your 60K bumper-to-bumper left).

 

I agree - and it's possible the replacement part they got was faulty, so they might need to start over. At first, I didn't let it bother me, but now we have had a weekend camping trip, a week at the beach, and numerous grocery shopping trips WITHOUT BEING ABLE TO OPEN THE TRUNK! Can't keep doing this! I might ask where the next closest dealership is and see if it is worth a visit. Thank you.

 

4th visit is next Tuesday!