ATT galaxy z fold won't unlocking

ATT has provide me with a code to unlock the phone. But the phone will not unlock. I called customer service and Michelle who I was on the phone with told me that it's a Samsung problem and transferred me to tech support. After spending 5 minutes on the phone with Samsung they told me that Michelle with att is full of crap and it's aptoblem on their end. What should I do? This horrible customer service is why I am trying to get away from att