I got some stuff just yest. I also have had stuff at every new stage, so around 4-6 months and again at 7-8 months. They have sent me some free stock cubes, some vouchers for their little biscuit things and free jars of food. A bit like the hipp vouchers that they send.
If you haven't had anything you could try signing up with a different email account, perhaps there was an error before.
Good luck and enjoy!