Did you pay using a credit card?
If so, you can simply drop the unit on their doorstop, and dispute the charge through the CC company.
They clearly have no grounds, since the service you purchased was not delivered, and the usefulness of the product is directly tied to the service.

No way of getting that day of your life back, however.
I'm very patient, but I would not have lasted that long...

Then, go someplace else...
Or DIY! (If you want it done right...)

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1986 300E 5-Speed 240k mi.