Parking issues in a condo building (HOA ineffective)

[Atul Mohlajee]

I own a condo in a 10 unit building and have a tenant there. The tenant has her aloted parking spot #5 with the condo. Most of the days, the tenant can not park in her spot because the person with adjacent parking spot #6 encroaches into my tenant's spot. I called the association repeatedly and HOA refuses to tow incorrectly parked car. The are asking my tenant to make adjustment and not asking incorrect parker to fix her parking. What options do I have stop paying HOA, deducting HOA fee for parking spot, or retaining a lawyer to sue association? Please help here.