Vodacom *****ing my airtime

I am very disappointed with the service from vodacom. I have a faulty data refill that keeps happening every 3 days. This started happening without my permission. Every three days my airtime is transferred into data. I have tried calling customer care multiple times to no avail. The one time that I did get through to an operator, she guided me to use the self service option. The customer care line keep transferring me to a self service option that uses a USSD function, this also does not work. I have deactivated the auto refill option multiple times each time I receive a confirmation sms notifying me that this function has been deactivated, yet 3 days later my airtime is changed into data once again. Customer care cannot fix my problem, since I cannot get through to any operator and If I get through to an agent via the sales department, the person just transfers me to the same number that I have been phoning for two months that does not work. I cannot continue losing airtime due to this problem and no one at vodacom has even tried to help me. I am very disappointed, I am willing to move to a different network because of this