['We just hired an exterminator last week for silverfish.  Now we have them worse than ever!', 'I have never heard of silverfish, but if you have to hire an exterminator that sounds serious. I hope you are ok!', 'They are bugs that get everywhere in the house.  I am pretty hacked off at the exterminator for not doing his job right']
That is really annoying to hear. I would be so furious if I was in your position.
We just hired an exterminator for silverfish, and they are back worse than before.