Parts supply for newer cars can be problematic, with the majority of production given over to building new cars rather than maintaining those that are already on the road. Ultimately it is a matter of staying in regular contact with both the dealer and windscreen replacement companies to see if a screen becomes available. You can also try and source one yourself from independent parts suppliers or salvage companies, but ultimately there is little else you can do in this situation other than making a complaint to Dacia UK.