Sellers failed to disclose HOA violations

We recently closed on a home. Following moving in we received notice of HOA violations. The seller was notified about 2 weeks prior to closing. What’s our recourse here?

Both agents are claiming no knowledge of the letter. I know we’ll probably need an attorney, but is really the only recourse to sue? I don’t think the violations are that extensive (bare spots on lawn, fence painting, etc) so suing is not going to be worth the time.