Regular turn around time for support E-mails is two weeks, but somehow support on Twitter responds within hours. However, their support on Twitter isn’t very good because they told me I wouldn’t get charged for data overages once I turned off the secret “auto-buy more data when you’re at 3/5 of your limit” setting but about two months later they did exactly that when I accidentally went over the limit.
I also had a strange problem where my voice would get garbled like static and they swore up and down it was because I had hit my data limit for the month (even if I used the phone on wifi). Turns out they had to fix something wrong on my account but they wouldn’t even look into that until it was still doing it on the next billing cycle.