bedbug question

[findingthegirl.livejournal.com]

We recently had a bedbug infestation in our apartment.*  Now that they're gone, our landlord has presented us with an exterminator bill for over four hundred dollars, saying it's our fault.  According to this PDF and this press release from the City of Somerville website, this is a tax-deductible expense that is the landlord's responsibility- at least that's how I read it.  Does anyone have any experience with this?  Should we be calling the Board of Health and asking them to intervene?  I mean, the bugs appear to be gone, but we really don't want to pay if it's not in fact our responsibility.

Thanks for any help you can give!

*We have no idea how we got them.  We never bring anything off the street, haven't been to any hotels since we moved in June, and both our previous apartments were bedbug free.  The current theory is that they were in the UHaul we rented and hitched a ride.