Stop taking my airtime!!!

<p>I am on a mtn contract where I receive data and airtime and free sms's every month on the 21st to be exact!</p> <p> </p> <p>The last three months on the 25th my airtime is gone!!!! I will make a call or two of maximum 20 minutes each and my whole R210 airtime is gone!!!!</p> <p> </p> <p>I am very sick and tired of this and I want it fixed! I pay for that **** contract and I expect if I pay for the full package I want the **** full package. Not half! Not full and then ******!! The full complete package!</p> <p> </p>