I've had shopowners do that to me, and it was easy to solve. Just send a lone cloaked thief (or anyone else invisible) up, and talk to him. Once you talk to him about something, he will forget that he was angry with you. If he stays angry, then just CLUA him in outside the shop, because then he is having trouble understanding if some chest in his store is open or closed.
-Brainless One
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