Frustrated & Angry

I got an sms twice this week stating the the mandatory account limit was reached and that my line is softlocked. I was quite confused about this and called customer care to query of this. First time, they unlocked it without any hassles. Today, I call the centre and spoke to Sandile. Where he stated that I went over my credit I have with Vodacom due to me selecting an occurring month to month data. I don't remember activating this, but got told that I may have done so accidentally. He also advised that in order for Vodacom i will need to pay R1100 to unlock my line. I find this ridiculous! As I feel like if it were added to my original amount for my top up contract that this amount should be going off at the end of November with my debit order without my line being locked. I refuse to pay R1100, which I don't have to unlock my line when that money can come off my account at the end of November and furthermore get this occurring data package removed!!! I am very unhappy and don't appreciate that I felt like I had no help in the matter. I wanted this sorted out immediately!