They switched it on years ago and nothing changed, I still get loads of spam calls.

Massive changes to international protocols aren't just "switched on".

Two years. No change. Maybe the last bits are clicking into place and it'll all get better any day now. Maybe. Or maybe the whole effort was scuppered with a well-placed caveat. I hope not, but that's what I'm starting to fear. I'd appreciate if you could tell me what's going on and put those fears to rest.