Airtime and Data being taken from my Cell number!

My cellphone is getting R50 airtime via Edgars account. Unfortunately my airtime and megabytes that I buy just vanish and i dont know why. I did not know when i was allowing to be recharged every month that Edgars is making my cell number a contract number. <br> Edgars does not disclose this to us when subscribing to receive airtime via account. <br> Now i want to know what to do to solve this: to cancel the subscription and return my number to prepaid and to ensure my airtime and data do not vanish.