That must have been a wonderfull f*up on the part of your service center.
Here where I live they would have to refund you the machine, if they weren't capable to repair it within 30 days (while under warranty, which I assume X1 Extreme was). The only manufacturer, whose service is able to achieve 30 days here is Apple ;).
With Lenovo, and previously IBM, I've had experience to have issues fixed NBD, even when I was retail customer.
Here where I live they would have to refund you the machine, if they weren't capable to repair it within 30 days (while under warranty, which I assume X1 Extreme was). The only manufacturer, whose service is able to achieve 30 days here is Apple ;).
With Lenovo, and previously IBM, I've had experience to have issues fixed NBD, even when I was retail customer.