Sup3r wroteIDM and Cyberia have this new weird policy of not being able to recharge if you still have days but consumed your quota. They'll be ripping you of with their "3$" recharge cards that gives you 2gb, until the end of your month.
it's been this way since forever with Cyberia, our start and end of the month are the actual month so we can't recharge more than once per month, if you need more quota you pay 4$ for 3 gb with cyberia, I don't see the problem here