(Edit - for clarity, I should explain how Chang had my number in the first place. It was an oversight on my part to have not explained this.
Very soon after Chang got the job at LFC, he contacted a number of bloggers - The Anfield Wrap, Redmen TV, and Duncan Jenkins. He sent a DM to Duncan explaining that he wanted to give certain bloggers more access to LFC - a presence at press conferences, interviews and the like - and to that end could I give him my number or email address. Naively at the time I thought it would be a great development for the character, so I gave him my number. With the benefit of hindsight, it seems clear that Chang knew exactly what he was doing and, having obtained my number, passed it on to whoever it was he hired to find me.)