Been using redone for over a year now. Didn't face your issue before. They always send reminders when you hit 70% of your quota. And you can check the usage using *123#. In my opinion redone is much better than crap Shitgi & fraudster Puxis. So this looks like a user problem.

+1

I also have been using it for almost a year and I'm satisfied with it. Sometimes though, they send sms alert saying data used already maxed but its actually not. Always uses *123# to check.