I purchased, what turned out to be, counterfeit phone chargers / cases from a major Chinese online wholesaler. Before selling I compared the items to one purchased at a domestic office supply store and it appeared to be the same. I sold roughly 15-20 of these items online and then was informed they were replicas and the item was pulled offline. I stopped selling the cases and sent the remaining cases back to the distributor. A couple weeks later I was sent a package via certified mail from Johnson & Pham LLLP that I comply with their requests, on behalf of the company, or face potentially damaging litigation. One of their requests was submitting no less than $20,000 for damages. I feel this is extreme considering the circumstances. Should I be worried / consult with a lawyer?