We Buy Cars - Bad after service

I’m really frustrated currently. Purchased a vehicle and paid cash for it on 17 October 2022 at The Dome. To date I’m still waiting for the Natis registration papers which is now more than a month and a half. I’ve contacted The Dome on several occasions, physically visited it as well, escalated to the manager and also logged call at customer services. It is just one promise after the other. I’ve been told that they will phone me back in 10mins, an hour, the next day and only to never get any call or feedback. I was told that they will send me a temporary permit I could use but still have not received such permit. The vehicle’s current registration has also expired which has neen known to them. The after service is absolutely non-existent.