Communication to client non-existent

I've been trying to change my billing e-mail address for close to 12 months now. I've tried contacting them via e-mail, online forms, I even phoned once and with which I thought I'd struck success, the consultant advised me that their records are updated - wrong.

I'm really not requesting a big deal, something simple. No wonder that these mobile services resellsers are having a difficult time - their support is absolutely pathetic. I'll surely attempt to move my business elsewhere.