But after reasonable action. As the landlord already hire a licensed pest control company to do some treatment, the problem is still not solved. You may hire some professional to inspect the property and document the property is not livable, you may terminate the lease without penalty.
Usually if the property is not livable due to accident demage, there is a insurance pay you a similar living place until the property be repaired. I do not know the landlord has such insurance and the pest problem is included.
I suggest you can do something to kill the pest by your self. It should be not too much cost.Those pest costrol company are treat for condition that tenant still live in. If you buy some pest killer in Wal-Mart or Home depot, you can do that by your self and get better result. Be very carefully using such pest killer by reading the label na dfollow instruction.