Handelt es sich hierbei um eine Phishing-Nachricht?

Hard to say. I’m leaning onto scam, but can’t say for certain. That link looks a bit sus, but not the worst I’ve seen, could be legit. Whatever the case, do not click the link. Instead go to Ropo’s own website and log in from there if possible. That being said, I’ve never had Ropo send texts, always via snail mail, so that’s also a bit suspicious.

I don’t think so.
Log in to ropo.fi and see if you have any due bills.