FREE WHATSAPP

I LATELY TEND TO FIND THAT MY AIRTIME I LOAD TEND TO BE USED OR DISAPPEAR EVEN THOUGH MY DATA IS TURNED OFF AND MY UPDATE APPLICATION OPTION IS TURNED OFF IN MY PLAY STORE.<br> DUE TO THIS I NOW ONLY LOAD R5 AND R10 AIRTIME VOUCHERS BUT STILL FIND THAT WHEN I WAKE UP IN THE MORNING MY DATA AND AIRTIME IS ALL GONE. SO MY QUESTION IS : WHY SAY FREE WHATSAPP AND WHEN I USE MY AIRTIME FOR ONLY WHATSAPP IT DISAPPEARES? THEY SAY, KEEP A POSITIVE BALANCE THEN ITS FREE, BUT SEEMS LIKE ITS NOT.IM DEFINITELY GONNA CHANGE MY SERVICE PROVIDER. THIS IS GOING ON FOR TOO LONG NOW . I MIGHT NOT BE A BIG SPENDER BUT TO WHO ELSE ARE THEY DOING THIS THAT DOESNT CHECK OR NOTICE IT?