Yeah you need to go to a different dealer. That tech doesn't know what the hell he's doing. And since it's considered it's a come back it is going to keep going to the same tech instead of a new one that might know what the hell he's doing. My guess is the evap canister or pump has a leak. They should be triggering the test and using a sniffer to see if it's actually leaking in the system. If it's not they should then be looking at other components of the system. Obviously it's not the cap or the neck they already replaced those. They are probably doing it to rule out you tampering with it as mentioned before.
I once had a car that was setting an evap code and the vacuum hose leading into the canister had a small pin sized hole in it.
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Biding my time till I get one. Waiting and watching  .
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