Copy Infringement From A Personal Pc Without Company Knowledge

Hello everyone,

so Idea Statica company emailed us about a copyright infringement case in our company, and telling us that we should buy it forever or they’re gonna have a case open on our company. However the pc details they sent were a personal pc of one of the employees, and he is no longer working with us, and we didn’t know about that at all. Are they blackmailing us or something? Can they win the case over this? Yes apparently that guy has been using the software to assist him in our work, but we don’t work with this software anyway, maybe he didn’t know how to use our program or something we have no idea. And it’s his personal pc it’s not even registered in our database. Is their case valid? We live in Qatar btw if it’s relevant

Thank you all