I had a similar situation here in the US, but it was even more ridiculous (although it was far less personally harming than being owed a large sum of money to be sure!)
On my old Model 3, I traded in my VW GTi, which still had part loan outstanding to VW Credit. First of all, getting Tesla to call VW Credit to get the payoff amount (which for some legal reason here in the US VW Credit cannot supply to me, they can only supply to the party taking the trade directly) involved about 5 threatening phone calls to the person processing my paperwork. Utlimately she called back saying "I had to hang up, I was on hold too long.....can't you just not trade in the car and we can take it off the deal?"
I mean, seriously?
It gets better.
The only way Tesla finally got the payoff was the person at the sales gallery I was dealing with called VW Credit and got the payoff amount. But wait, we're not done yet.
I get my car, and the next month I get a bill from VW Credit. I call them up and tell them, I don't have the car anymore, Tesla does. They look in the system, verify it, and say, you're good, don't send a payment.
Next month I get another bill, which includes last month's amount plus penalty. Again, I call and say "I sold the car, don't send me any more bills". Turns out, Tesla had already sent them the payoff amount within 3 days of taking my car, however they had failed to return the paperwork required for VW to close out the account! Which means VW still hadn't sent them the title! So Tesla is out the money they paid on the trade, and weren't legally allowed to do anything with it for 60 days. They just sat on a dead asset and couldn't even process it to their wholesaler, because someone internally hadn't sent over the right paperwork.
What an absolute joke.
To the OP, I hope you get your money soon. If not, start tweeting Elon and @'ing some people guaranteed to give him a hard time. Sad that's the only thing that seems to get their attention.