PokerStars Affiliate Scamming?

[PokerKhan]

I'm a PokerStars affiliate. In the past two months I have had a couple of new player sign ups through my affiliate links to PokerStars. I have not been paid for the sign ups and neither new user shows up on my affiliate reports. I have complained (by e-mail) to the PokerStars affiliate manager. He wrote back that he would look into it. But that was week's ago and I haven't heard a word since, and he doesn't respond to my many follow up e-mails.