I received an email today saying this.
The price increase is from September.
BT will never ask you to verify account details via email.
Thanks for your post and welcome back!
@gg30340 is absolutely right. It looks like a scam. BT would never ask you to verify your details via email.
I've just had to edit the post as the link is suspicious and we can't have that on our site as I am sure you can appreciate.
Thank you for being so vigiliant!