I feel for you man - I just went through this at work, only in my case it was technical and hands-on stuff. Like you, how he got through the hiring process was questionable from the day I met him. Several of us tried to tell the guys who hired him but it felt like it fell on deaf ears. I showed him step by step how to do simple tasks and he still couldn't do them by himself. You can lead a horse to water, but you can't make him drink.So we have a new guy on our team. I was somehow selected to train him. I thought no big deal, but the guy has no idea how to use word or really computers in general and our job is 100% done on computers. Not sure how he was hired not understanding computers and word, at least the basic functions. I'm trying to make it as basic as possible for him, but he's not getting it. Not sure what else to do right now. Just frustrating.
I had faith that the situation would correct itself eventually, and that happened on Monday. In fairness they said they tried their best to give him the benefit of the doubt, but after four months of mediocrity they finally ripped off the band-aid and let him go.