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The Invoice came 5 Weeks after I ordered simultaneously with the text that a car has been allocated. If the estimated delivery time for you was longer, then it could also take longer to get the invoice. It seems to be connected with the allocation of the car.
I ordered a performance on the 21st of December 2021 and still nothing. I don't think any performance vins have been allocated...again. If I get mine within 12 months of order, it will have only occurred through divine intervention!