as CA said, use a different supplier. i have had this happen a few times in the past year and unfortunately they were all my fault except one. be sure you never let the end of the filament on the spool out of your hand. as soon as you let that go it will unwind a little and can get under one of the other coils without you noticing. sometimes it can take a few hours of printing before it finally locks up. print yourself out a bunch of little filament clips so as soon as you remove the spool from the machine you can clip the end in place.