Flying Ants

I have been working in my office in the evenings all winter but when Barb left for Naples I was by myself working in my office and there were all these ants flying around my lamp and crawling on the lamp shade.  I looked up and they were all over the wall and they were dropping on me, my computer and my papers.  I noticed they were coming out of a small hole in the wall where it met the ceiling.  So the next day I called the bug people and they said they would send someone out to look at it for me.  The guy came out in the afternoon but the ants don't come out in the afternoon, they only come out in the evenings.  The guy said that he had sprayed outside along the roof a few days ago and that the ants were probably coming in to get away from the spray outside.  He said they should be dead by tomorrow.  So he didn't do anything.  That night there were no flying ants.  So I thought he was right but then the next night they were back again.  So I trapped one of the ants under a glass and the next day I phoned the bug people again.  The same guy came out to the house in the afternoon and I showed him the bug I had trapped.  He confirmed that they were flying ants and put out a few ant traps around my desk and around the window.  I told him where I saw them coming into the house but he couldn't see the hole where the wall meets the ceiling because the hole was too small.  He assured me that the ants would be all dead.  I was worried because we were going home in a few days and I didn't ants all over the house all summer.