Mtn *****ing my airtime

I had R110 airtime & 300 mb of data on Sunday & I didn't make any calls, or watch vids online but I woke up this morning to find ALL of my airtime & data finished. <br> <br> And then I tried to buy R15 airtime with loyalty points but when I try to call it says I have insufficient airtime but when I check balance on *141# the airtime is there. <br> <br> I want to know what chowed up all my data & what is the use of these loyalty points if you can't actually use the airtime that you but with them. <br> <br> I used to love MTN but now I think you people are ******.