Airtine ****** by MTN and call centre attitude -

I have a contract with MTN for over 10 years now and they now decide to ***** me and its not acceptable. With this contract, my daughter receives airtime for R100 and 250 megabytes on the 14th of every month. She received these on the 14th of may and by the 15th she had no airtime and no megabytes. I called MTN call centre of which by the way you hold for an hour before anyone answers and was told that she used the internet. <br> <br> My daughter checked after logging off and she had 60 megabytes left and airtime was still R100. A day later all the airtime and megabytes was gone. I need to know where its gone to and i want this in writing to me. Yesterday she loaded airtime for R5 and that was also taken - Whats going on????