Cancelled or deactivated sim card

Im using a Telkom Mobile prepaid sim card number ********** 587. On the 27th i went to Telkom Mobile in alberton to check why the sim card isn't picking any signal. I was informed that the sim card was cancelled the same morning. No one including the call centre(after hanging up on me quite a number of times) could explain why the sim card is deactivated. I have logged complaints with no response. There is data in that sim card, soon to expire on the 1st of January. The call centre informed me that they will escalate the query but there is no turn around time(how shady) I need clarity on the way forward