Is a tenant responsible for exterminating an apartment for bed bugs?

Question Details: I have resided in an apt complex for almost 15 years. In the last 5 years, I have seen bed bugs come and go in my unit as well as other units and the whole building was treated for both roaches and bed bugs at that time. Since then, I have seen signs of them bed bugs, not roaches which I have treated myself and it seemed to work. Recently, I have seen them again and reported them. I received a letter from the rental office that I am responsible for the treatment which is $400 It went on to say more or less that since we brought them in, we are responsible. I know that there were other tenants that have had them and since moved out. The letter also states that I would be responsible for treating other units if they get them. Is this legal? What do I do. What do I say to them? And, if I do pay what they want, they will simply spread to other units which they threaten to charge me with treatments needed. Shouldn't the whole building be treated? How could I have brought this problem in when I moved in here almost 15 years ago?

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