Thanks for the responses. The Hilton Ambassador has now contacted me so I'm hopeful this will finally get resolved. If not then as suggested I will contact the Data Protection Authority in the UK where I am based. Regarding the questions above... I don't have email addresses for the intended recipients of the latest batch of emails I received, just their first names. These were all 'You've been upgraded' notifications from the same Hotel (a different Hotel to the misdirected emails I received when this problem first occurred back in 2020) and the emails were intended for a number of different guests, not just one. They were sent from [email protected]