I ordered a FM126 as one of the first customers. I think they went 3 or 4 months behind schedule. Jack does a good job, their main business is not D2C, and you are rushing a frame that had its geometry changed in late June. It was never going to be ready for you on your timeline. It's unfortunate that most Chinese companies give "just another week" deadlines, but this seems like having mismanaged expectations for buying a brand new frame model.
If you didn't want to wait, you probably should have stuck to a frame that was already in production.