my data still expires...why? no help from mtn

My data is not rolling over, after 30 days i still have about 3gig from 10gig bought.

Last month my data disappeared, today i got a message saying my data will expire in 48 hours, data i purchased in the 20th or 21st of May. I called MTN contact centre at 16:15 today, I waited for about 10 to 12 minutes to speak to Malakhiwe's teamleader, whose name was not provided, at the end of the call there was still no team leader to speak to and Malakhiwe said i need to opt in for my data to roll over. How is it that my data still expires after Icasa made new prounouncements? Malakhiwe at first would not provide me with a reference number when i realised that i would not get any help. At the end of the call the reference provided was ***.