How do I block a texter who has aname but I can't see his number?

I get a weekly text from a takeaway I used to use when I lived in a different city 3 years ago. I comes from Alis t/a and I can't see the number and also there's no text box at the bottom to reply.

What witchcraft is this!!

Help me Obi-Wan Kenobi.......

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