What noises are they making? Is it talking or music or dogs or what?

I'm going to give similar advice as I just gave someoneb else, so I'm gonna end up sounding like a shill, but: switch up your white noise. You're trying to block the noise, probably by blocking a pretty wide range of frequencies, but you don't need to do that; you just need to make the noise more palatable to your sleeping brain, so that you can sleep through it.

I use TMSoft's White Noise, which has a lot of flexibility. There's a free version (I think the sound fades out over time) but when I bought the full version it was only like $7. You can mix your own soundscape, which is great. My combo for masking sounds while I sleep is:

• A base of pink noise. That's like white noise, but instead of being applied equally across all frequencies, its focused more on the levels we hear more. [There are other 'colors' of masking noise; you can read up on them and hear samples here .]
• Pink noise was a great base, but it was a little too "one note" for me - it really sounded like I was trying to mask sounds (which is what I was trying to do, but then I became focused and annoyed by the fact I was trying to mask noise). So I tossed a rainstorm on top of the pink noise, to make that more palatable. That worked great, but became annoying over time - I eventually figured out the "rain" was a little too high-pitched, but they have a setting where you can easily adjust the pitch, speed, etc, of any noise in your mix. Once I down-pitched and slowed the rain a bit, it was great!
• Until later that week, when the garbage trucks came around - grumble! I tried blocking that sound but it was too hard - and then I realized I didn't need to block it, just make it so my sleeping brain didn't notice it and wake me up. So I tossed an extra "heavy thunderstorm" into my mix (with lowered pitch and increased variability). That worked great, too: the extra, intermittent bass notes mean that my sleeping brain generally ignores garbage trucks, vacuum cleaners, lawnmowers, etc.
• There are occasional shreiks of children playing; I tossed in some occasional birdsong to make that less disruptive. Since this was less frequent, I moved the birdsong to be more of an intermittent background feature than a central focus (like the rainstorm is).
• I also tossed in the sound of my cat purring as well, just because.

This mix easily lets me sleep through most noises, because my sleeping brain interprets "garbage truck" as "extra long thunder" and "children screaming as they play" as "loud, noisy birds", which evolution then tells my brain to ignore.

And I know it sounds like I'm some kind of mix-master, but it was really just paying attention to what was specifically bothering me with the sound I was creating, and then adjusting for that, which the controls make really easy. Like I said, it turned out the rainstorm was just a little high-pitched for me to have on in the background for a long period, but once I'd made it deeper and a little slower, it was great. [TMSoft also lets you import your own sounds to play around with.]

Anyway, I'd suggest adapting your white noise. And I'm not trying to shill TMSoft, but they've given me better sleep than I've had in years, but check out any white noise app that lets you adapt your own soundscape. At the very least, go to that Wikipedia page I linked back at the beginning and listen to the difference between the noise samples there, because I really think you want to start with pink or maybe brown noise as your base, then adapt from there.

Good luck!

Might want to consider a noise complaint then, that's awful...