Welcome to the community and thanks for posting. Sorry you haven't had any information about when the voucher will come.
I've managed to locate your account to check this. I can see you have spoken to us since posting and your details have been sent to the voucher suppliers. They will email you in due course so please keep an eye on all your folders including Spam/Junk etc.
Furthermore, I'm afraid we don't carry the Sky Atlantic channel and I don't know if we will in the near future.
Hope this helps. Please let me know if you have any further issues.