How to keep solicitors away?

[Stone Teran]

I have a Time Warner cable sales rep that is often visiting my apartment buildings knocking on doors and leaving his flyers on doors which ends up all over the halls and parking lot.  I saw him recently and I told him to stay away and he said he was visiting a customer and blew me off.  Later that day I saw more flyers on doors.  I called him and he said he wouldn't return and hung up but my caretaker sees him back.  I have enough trouble with trash as it is.  Is there a way I can convince him not to come back?