Baz, I'm not sure if you read my comment in full. It is as simple as initiating communication via email. Which is why I say I don't know why they say they can't do that much..
I did a course several years ago and part of that course involved learning about copyright, moral rights, mechanical rights, and although I'm certainly not an expert I do have a decent understanding of what is involved. It's not true that the way through such a matter is to jump deep into legal battles which cost lots of money. As I said, U900 would obviously have rights to their logo, they also obviously have a contract with Anuenue.
So, Baz, as you are in communication with them why don't you simply send them an email and suggest that they send an email to U900 informing them of their knowledge of the misuse of the U900 logo and the breach of their contract conditions, and let them deal with it. Initially they can request the cessation of the production of the particular product, without a court case and without expenses, except the expense of an email. As you say seeking compensation may be a waste of time and money, I'll leave that for them to decide, and truth is U900 may even benefit from the exposure and be pleased about it, we don't know, but requesting the cessation of production is worth the effort. Usually if the logo is registered then they probably won't even have a fight, it can be the case in a lot of cases that offenders comply and cease production, so to assume it has to be a full blown legal battle is simply an unnecessary assumption, take the first steps first, and let them deal with whatever happens afterward.