If they're smart they'll just find a legal reason to fire you. Ever surf the web for personal reasons at work? Every use your personal mobile on work time? There are so many rules that people violate every day without repercussion until the company needs a reason to get rid of them.
If they're smart and they want you gone, they won't bother with petty stuff like that. They'll just run you through the formal process, six months of PEP then PIP then fired, speaking the ritual words and performing the ritual ceremonies necessary to generate a paper trail that will comfort the lawyers, all tied up and neat. You'll know exactly what happened but there'll be nothing you can prove.
If they're smart and they want you to stay, they still won't bother with petty stuff like that, because firing people is expensive and hiring them even more so; they'll either look the other way or find a diplomatic way to deal with it.
What kind of company do you work at that has such rules explicitly spelled out? What's the procedure for firing someone based on that data? Don't they need proof of such activities? Does your workplace have cameras and sound recording at all times trained on their employees? If you do and you don't enjoy that, then maybe it's time to look for something else?
