Vodacom NO Help, please HELP!!!

I have x3 cell phones x2 WiFi contracts with Vodacom and am happy with the services so far. I encounter a problem with my x1 phone main number this past week. My Google Chrome browsing has been hijacked by x4 unwanted ads, pop-ups & malware. I tried following the steps given by Chrome help & support. It is not working. I will open my phone and they are there or will be in the middle of a call, and they pop up 24/7. I do not download any apps extra unless I am 200% sure they are officially authorized company apps I need and do not open pop-ups. I have been to three Vodacom store tech support they all say I am crazy and it is my fault because I download apps without checking first, when I give them my phone they cannot find anything on my phone and say they cannot or will not help me or they do not understand the problem. This is eating my data as when I wake up in the morning I see the pop-ups have been loading for hours and hours.