I last attended a certain weightloss group five years ago.
However over this time I have received the odd text message about certain offers or 'reminders' about things. I have never replied to them nor attended group.
I am aware it might not annoy some people but this evening I got a massive text message from a consultant (not one whose group I have ever attended!!) reminding me that this slimming club is there for me, cheaper than usual and weighing in from home, how they'd love to welcome and hug me and that their bars can now be ordered "straight to your door" 
It has (perhaps irrationally) angered me.
For a start, they still have my data five years on? It has been shared to another consultant/team developer and this is who messaged me.
I do have issues with this brand mind you, I left and joined a gym and have never felt better without the guilt of eating or banning certain foods.
But I want to reply asking them to remove my data and telling them they've breached gdpr - but am I right? Happy to accept I am wrong.
(I am aware there are worse things happening in the world but this triggered me this evening)