I live in an very exclusive apt. & about two months ago I saw a roach. I figured then that would be the start?

of a problem. I have 4 neighbors connected to my unit. Have been living here almost a yr. & haven't seen any pests besides 1 or 2 gnats. The Mgr. ured me that this wasn't a roach infested complex & I agree. He seems to think that they were brought in from moving boxes. I bought that at first, but with the reaccurance, it seems to be a unclean neighbor. I received pest control 2x already, they go away a couple wks & are back again. Pest control is administered on the outside & only in the inside if requested. Any suggestions on how to get rid of the pests. P.S. - my place is close to immaculate.