I've been playing this game for a few years and have only come across 1 known cheater and they took it very seriously, to be fair. He was banned. However, his team wasn't dismantled until after he'd knocked me out of the cup.
Still, they fixed that after I reported it and apologised.
I have to say that I think it's a bit unlikely that they will ban paying customers unless they're a constant menace...remember, you're a gamer and they're a business.