I started the following thread in the 'Help And Support' forum a couple of months ago.
It ultimately transpired that these emails have been made 'compulsory to receive' by Giffgaff and I am not very happy about it. What most surprised me was that the E.U. GDPR took effect on 25th May 2018 and these annoying emails also started to surface right around then. For the record, I am not formally arguing that these emails contravene the GDPR, just that it seemed an odd time to start pushing them. Anyhow, someone on my thread recommended I start a new thread in this forum on the matter, so that maybe something might be done about it. I have now done so and I hope that I will soon be allowd to opt out of receiving them Thank you.