We just bought a house a year ago apparently in an ant city..... Rambo pest control has kept them in.their place outside.....fast service and always keep me in the loop if they have a delay.....
Ants are tough to get rid of. I put ant killer in every corner of every room inside and outside. Also, you can dust all your trim inside with baby powder and they won't cross it. Replenish every couple months and they should stay out of your house. Worked for me.
I have a success story with ants and spiders. The quarterly service from Rambo removed all signs and has kept us ahead of any issues
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