Unsubscribed email ?


New Email
For years I have been signed up to a restaurants promotions newsletter , then all of a sudden it just stopped .
I have spent so much time trying to sort it out, they told me I hadn’t clicked the box to say I want to receive emails ( it has always and still is ticked ? )
Now they’re saying at some point I have either blocked their email address or unsubscribed - I have done neither
I am using yahoo mail and have managed to check which emails I am subscribed and unsubscribed to . The restaurant is not on there anywhere ?
Has anyone got any ideas ?
Its a restaurant I use regularly and like to save a bit of money where I can
Thanks in advance