How can I disable 'reminder' messages from Google?

A

AC Question

Every day I recieve messgaes from 'Google' reminding someone named John Backhouse (not myself) of certain events.
I have a Samsung Note 3 and this has been going o for about a year and I am sick of it. They usually come in around 7am but sometimes around midnight or closer to 2 am. I have tried adding this contact to my spam numbers but whenever I do it tells me 'Invalid phone number' and I have spoken to my provider Vodafone and they are clueless on it.
I would appreciate any insight into my predicament.
Thanks, Tim
 

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