Thank you for reaching out. I've had a look through the account on our side and am also unable to locate this email which has been sent to you. As your contract will not be affected by our recent price changes, I'm unsure as to exactly why you've received this.
As it stands, you're in contract until July this year. If you'd like to discuss any further contractual matters, please give our Customer Options Team a call on 0800 013 2632