I voted yabu OP but I actually understand how this is upsetting for you and do empathise. If you spend you life scraping by and then suddenly come into money which you hope to use to better your situation, it is horrible to discover that actually you'll need to use that to get by and can't therefore do much to change your situation.
That said, we don't have an infinite pot of money and so there have to be decisions made about how it is spent and what the thresholds are. Because of that, if you have substantial savings (which arguably over 16k is) I can understand why the government takes the view that you are no longer sufficiently in need.
To the poster up post who said should everyone have savings after 16k taken off them, that is different as it is savings where the government isnt providing support. If I lost my job, as I have savings over 16k, I wouldn't get help until it has gone below. That sucks when you've worked hard to save (as someone on benefits who saves also wouldve) but I get it. I once had to look at what we might be entitled to when my husband lost his job and basically we wouldn't have gotten anything bar job seekers as we owned a home, had no dependents and his income that year was over the threshold (he earned a modest wage in employment). We didnt have over the threshold of savings. But it came back saying £0. That terrified me as it was all well and good calculating help based on his previous wage but we didnt have that money anymore.
During the pandemic, I was entitled to nothing as a self employed person as I am over the threshold. I get noone would be sympathetic but obviously not everyone has savings as they dont expect this. Luckily I did and, in the end I found enough work, but people I know through work didnt. They all had to use whatever savings they did have - some had little. I was fully prepared I'd have to use my savings if needed having not long returned from maternity and already had to save before that and use up savings during it because I didnt have an employer paying maternity for me.
In summary - it sucks and I get it but yabu on balance.
In practical terms you've had some great advice about ways you might be able to legitimately spend some to invest in yourself and better your situation and then potentially fall back under 16k. Try that. Then you will get to improve your situation. I really hope that you can x