Sorry to hear this. What does the Exterminator say as to why??? I'd suspect he has SOMETHING to say. I know Dryvit Systems, among others, are part of a Class Action Law Suit involving EIFS homes between 1969 and sometime in 1997 (I think.) Perhaps with this in mind, the Exterminator is reluctant to do anything.
Again, what does the Exterminator say? My best to ya and hope this helps.