High-rise building condominium rules about bed bugs extermination?

Couple weeks ago I called to our condo ociation and asked if they could help with bed bugs that I had just discovered in our bed. They offered the professional exterminators who came same day and found a bug or two in the bed. When I asked the ociation who would pay for their work they said that the owners are responsible. I found out that I it would cost several hundred dollars if not thousands, and we cannot afford this expense. So we bought the bed-bug spray in the Ace Hardware store and worked all day with it. Bought the mattress and box spring protectors, disinfected everything around the bed. And canceled the extermination service. Now our condo ociation insists that we use the exterminators' service at our own account and if not, they will make us pay for the extermination at our neighbors' unit (who recently moved in and supposedly brought those bugs to us, not the other way around). I regret now that I contacted the ociation because now we have to deal with them. I figured that to pay their fine would be less expensive than the extermination service... Any thoughts or suggestions? Thanks in advance.