Wasps being allowed onto my phone without me even using my phone.

I found that I was being billed 10 Rand per day for a wasp. I figured ok maybe I did something wrong. Then the Vodacom staff helped me cancel the wasps and they were successfully cancelled.

I have not used my phone at all since the day before yesterday. This morning I checked my airtime balance and I saw that R10 went off again. I had to cancel that wasp as well.

What is wrong with your security that you simply allow wasps onto our phones? I KNOW I didn't click any links or phone anyone yet I got a wasp. Please explain that to me.