I recently recommended my friend to my systems manager for a technical support role, because I had already worked with him on networks and support and I taught him myself. He was hired. Since he started working here, there has not been a day when he does not receive a complaint from the systems analyst (his superior) about his performance. Every day I indicate the points that he should change in order to improve his work environment, but it seems to me that he is not listening.
I emphasize that before he started working here, the manager told me: he is going to work here because you gave him as a reference, and you will be responsible for him (maybe he was joking). Am I really responsible? What can I do?