Pathetic service

I got ****med by someone who claimed to be from MTN. Yes I admit I was at fault there by giving them answers to my security questions. However I did not give out my ID Number or any other personal information such as my home address etc. The next thing my phone is not working. After a couple of hours I decided to make a call and noticed that I had no network. I then proceeded to call MTN who then informed me that I have been ****med. I asked MTN what is it that they are doing to protect us the consumer from such where these ******** can do so much with just security questions? And was told nothing and they left it at that. So we pay and support/make use of their products and we are not protected at all?????