Not a lawyer. Talk to one. In your country. In the USA, if there might be customer confusion between your two businesses then there is grounds for a cease and

Not a lawyer. Talk to one. In your country. In the USA, if there might be customer confusion between your two businesses then there is grounds for a cease and desist, but you have precedence. Might consider turning the tables and sending them a cease and desist :) perhaps they’d like to give you the .net domain as an apology