Please note that, if you are in the UK, the Right to Complain means that you now have to first raise your complaint with T101 as the data controller before contacting the Information Commissioner’s Office

The supervisory authority is

Information Commissioner's Office
Wycliffe House
Water Lane
Wilmslow
Cheshire
SK9 5AF

Tel: +44 (0)303 123 1113 (local rate) or +44 (0)1625 545 745 if you prefer to use a national rate number
Fax: +44 (0)1625 524 510

Web: https://ico.org.uk/global/contact-us/