Mtn
When current is not current

My statement for November
Current balance - 979.50 Due date 25/12/2013 Credit limit 2400.00
Service suspended 9/12/2013
For some inexplicable mtn reason after 21 days, some current becomes 30days, and due, despite the statement above.
Now have the misfortune of being on the customer service (joke) for so far 30 mins listening to inane advertising
How can a hightec company be so technically useless?