If you bought the house at auction, this is the risk you run. When you buy the house at auction, you inherit the HOA liability existing at the time. Reason being, HOA debts are attached to the property, not the person. So, when you buy the house, you get the HOA debt along with any dues, penalties, and collection cost that are authorized by the CC&R's and state law.
As I recall, no court hearing is required for a NV HOA to file a lien, it is an administrative procedure.
Path of least resistance, pay it. But at least try to get an accounting. To do so, contact the HOA directly for an account summary.
Note that Nevada law is different on this than most (all?) other states.
Every answer you get from an attorney without an NV license will probably be wrong (as well as the Unauthorized Practice of Law in this state).