Can I get my RN number back from lease company and finance it cash or PCP?

[Jmad]

Evening,
I purchased the model Y on release day by placing a deposit through Tesla.
I decided on a lease but yet to sign off the finance contracts but the leasing company has been sent the RN number and taken over the car.

I am just wondering if anybody has managed to get their RN number back from the lease and finance it by alternate means?

Cheers