For what it's worth they're still having the same issues. I just signed up 2 phones with Smarttone, and stressed to the salesman that I wanted everything in English.
Of course everything from the welcome texts, to the phone hotline, to the voicemail system is in Cantonese - and there is no way to change it for yourself. You need either to visit a shop, or call the hotline from a phone that is *not* your registered mobile, and try to get to a human.
I got a Cantonese friend to call the Chinese hotline and get someone to call me back, which they did within 3 hours. They changed my setting so that the 3 (useless) options on the hotline are in English, but all the voicemail is still Chinese, and I can't get the option to change to English (3, 2, 2,) to stick.
I'm sure once it's set up the system will be fine - but for now I'm almost ready to tell them to stuff it, demand a refund and go back to three.....