I called again to ask someone to come and see those ants.
So it should be easier for them where to spray.

In Thailand, ants are the part of life so housekeeping persons might not care too much about them, but for some of us, it is annoying, especially they bite us and come into our belongings.

I hope they did not come into my pc!

UPDATE: Another lady(seems to be a management staff) came to see the problem and apologized me in person.
I am glad they acted properly and paid attention to the issue.