That was silly of the manager not to do any proper investigation before sending you away and these are the things that use to make some people say that they can't work in a company.
A lot of managers overuse their power to hire and fire people. I am happy you got vindicated in the end, accusing people wrong is not a good thing.
Yea he ought to make proper findings but then his anger issues wins the race immediately he realised everyone affected where people I suggested to be employed.