Roach infestation, help with exterminators and cost?

Recently moved into an apartment in the slope (4th floor walkup) and have recently seen two huge American cockroaches. They’ve been about 1.5″ long with the ability to fly. The landlord up to now is refusing to get an exterminator insinuating that we’ve brought the roaches in with us in our mattress. Regardless, we’d like to hire an exterminator to take care of the problem as opposed to being traumatized again. Can people suggest some good exterminators in the Slope? Also, on average, how much do they cost or how is their pay determined?

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