FIBRE UPGRADE WITHOUT MY CONSENT

A few weeks ago, I get another one of these upgrade calls while I am at work. I ask them to email me the details as I can't discuss these things while I'm busy working.

I didn't receive any emails or any further communication, but when my next bill came, I saw they upgraded me. This was obviously without my consent.

I feel that I would like to lay a formal complaint, but dealing with their customer service is a nightmare.