Yes, claimed for the Sainsburys offer on 2 May using the special claims at BT.com as instructed.
OK!
Unfortunately the BT Reps don't seem to have been around for a few months, on here.
However, I would suggest that their advice would have been to raise a query via:-
https://bt.custhelp.com/app/contact_email/c/4950
Within that, you can specifically highlight your post here!
NB:- it tends to beat the Call-Centre!!