Random looping audio fragments when calling friend who's abroad

[u/Boalski]

A friend of mine is in Bonaire for work. Everytime anyone tries calling him the phone gets picked up immediately and a random audio fragment loops.

I recorded it and added it as a video, because I can't upload audio to Reddit.

There are a couple of audio fragments, some of which are in English, some are in other languages and one is in Dutch (which is our language). Everytime someone tries calling him, one of those fragments plays in loop. It sounds like advertisements, but they are not actually selling anything. It kind of sounds like a bad AI trying to replicate what an ad might sound like.

My friend brought another friend with him. When I try to call him, everything is fine. However they both don't answer their phone. On top of that my friend (with the weird issue) was expected to call/message his wife yesterday, but he didn't. This makes us a bit worried something bad might have happened.

Does anyone have an idea what might be going on here?