USELESS SO CALLED SERVICE PROVIDER IS TAKING MY AIRTIME WHEN I HAVE NOT EVEN USED IT

MTN IS ONE OF THOSE USELESS SO CALLED SERVICE PROVIDERS THAT TAKE YOUR YOUR AIRTIME BEFORE YOU EVEN USE IT.NO WONDER THEY BATTLE AND STRUGGLE TO HAVE CUSTOMERS .THEY HAVE ALSO JOINED VODACOM AND ARE ALREADY DOING WHAT VODACOM IS DOING [TAKING YOUR AIRTIME TO MAKE SOME PROFITS]