Max stats cheating in PVP arena

How do you guys deal with it?

I just had a Glaivier going absolute berserk and hammering her 8 skills in 2 seconds into my entire team, no way to stop her.
When I called him out on it, he must have disabled his cheat and I stomped him, but it was to late and game was lost. That player was just Ultra 8…

This is the second time I encountered a player with much faster attacks then you could possibly achieve with just 750 swiftness.

So what to do? How is it even possible to cheat your way past the book of coordination limits?

Speed hacks, there have been reports of cheaters in ranked pvp for a while now but nothing is done about it