yes, that's the basic rule.
If some one believes that another manager is cheating, he can send a report and if something is non legit, nord support will take care of it.
This is what I would do.The only solution I can see for you is to stay level next season.
Or else you 'll keep playing with him for all the next seasons even if you are not friends anymore.
Of course anyone is playing as he likes but as I m main team was a trophy hunter, for a couple of seasons I was in the same competitions with an Italian token buyer so I decided to stay season and not playing together anymore.