MTN AIRTIME DISSAPEARING

I have a serious issue with MTN, my data and airtime disappears , in the last 3 weeks I have recharged with over R1500 and ALL MY AIRTIME DISSAPEARS and they told me to contact *** BUT EACH TIME I CALL THEM IT NEVER GOES THROUGH THEN THEY TELL ME LINE DISCONNECTED. I have been recharging and after a second or 2 both the airtime and data disappears again , I need my airtime back , this is a serious inconvenience because THIS IS A CONTRACT PHONE AND MY MONTHLY LOADED AIRTIME AND THE AIRTIME I BOUGHT AND LOADED HAS DISSAPEARED and need an explanation as to why this is happening , they tell me about the settings in my phone<br> <br> I have been using the same phone for the past 4 years and it's only recently that this started happening , I have been using MTN for the years and on the brink of porting me and my family to a more reliable network <br> <br> I cannot make phone calls to my family when I need to , MTN better investigate and let me know what the issue is and also refund me because I did not use the data and airtime that I bought. My cell number in question for the airtime that has dissapeared is ***. Please return my airtime urgently.<br> <br> <br> Regards<br> Angry Customer