If it's happening to you, that means that you haven't installed the security and ad blocking software on your phone that would prevent this.
Yes, the BI admin can work on this from the server end, but that won't stop the next malware attack that takes advantage of your phone's vulnerability.
Actually, the real issue for you is that your phone is vulnerable to malware attacks anywhere you go on the web. Don't be fooled if BI "is the only place this happens." All that means is the malware here is unsophisticated - "good" malware doesn't let you know you've been infected, and gets your information and/or utilizes your phone's resources without you knowing.
It's not hard to protect yourself. Just go to the iPhone or Google (Android) store and search for the highest rated security, vpn, & ad blocking apps.
I'm an Android user, and use Lookout, Norton VPN, and ad blocking apps (all three). None of these slow down the phone. Even so, I always utilize an "incognito" browser when I'm not sure about a given site.
All this may sound like a lot of work for you. These days it just needs to be like using seat belts - something you do that has become second nature to keep you safe. The programs I've noted aren't "guarantees" but there are enough unprotected phones & laptops out there that the bad guys generally don't find a protected device worth hassling over.
Hope this helps.