I also have the same problem with no voucher received from BT when clearly advertised with the mobile offer as shown in the copy emails below.
Welcome to the forum and thanks for your post!
I'm sorry for the delay receiving the £30 Amazon voucher that you signed up for as part of your order for BT Mobile. I have moved your post to start your own thread as that's the best thing to do.
Can you send us over your details so that we can chase the voucher on your behalf and make sure you get it as soon as possible? Click on my username here >> RobbieMac << and you'll see our contact link on the left hand side underneath my profile picture.