Birchbox review: I got only 3 boxes, but my subscription would end soon

I subscribed for the website www.birchbox.com. I paid for the 6 months subscription, but it would finish soon. However, I have received only 3 boxes. I already asked the seller, when I would get the remaining boxes, but still this guy hasn’t provided any info or help. It was really strange and suspicious experience. I won’t advise it to other people, because it is impossible to prove anything.