Sue them for one dollar. To have any hope of winning you need to prove damages, perhaps you could sue them for unlawful restraint of trade. There's something

Sue them for one dollar. To have any hope of winning you need to prove damages, perhaps you could sue them for unlawful restraint of trade. There's something about a process server that will get anyone's attention. Alternatively sent a registered letter, return receipt requested, to their general counsel, then politely ask them to stop being such jerks.