Unacceptable behavior from a worker.

We are busy working on a site (Sea Point), doing work for the City of Cape Town and this company is busy on the opposite side. One of the workers keeps on coming to our side, so we asked that he must leave our site and he starts to swear at us etc. I phoned the manager/ owner and advised him about the problem we are having. He told me he will sort it out, but he knows which guy I'm talking about because this guy always gives problems

A big company like this that knows that someone is a problem should not send them to site is my opinion.