So I just opened up the website in incognito mode and the chat function reappeared! I sent them this "Hi, I spoke to someone earlier who confirmed my car had been allocated. Can you please supply me with the VIN number, I have seen others on the Tesla forums who have received theirs after allocation. My order number is RNXXXXXXXX"They said I have to wait for a text, that there is lots of variables. Not very helpful to be honest.
And I got "The VIN currently assigned is LRWYHXXXXXXXXXX, we will confirm via SMS the correct VIN and registration number soon"