Hi
there were big problems at the factory a while ago, and it resulted in many pack being 'blown' by the time you recd them!!
I do not use it now, but everytime I had a problem, I took it back to the shop where we had brought it from and they happily refunded, as when the rep came round, they complained and got replacements.
I have also had great success complaining directly to Naturediet, and they sent out replacement packs to both my sister and myself!
hope this helps!