When you buy a rocket launch, usually there are progress payments as the rocket is built. And if you stop paying, you forfeit the payment. So likely there's not

When you buy a rocket launch, usually there are progress payments as the rocket is built. And if you stop paying, you forfeit the payment. So likely there's nothing to be refunded... and the rocket maker is stuck with 18 partially-assembled rockets. Which is an entire year of launches for Soyuz.