〜では済まない・〜では済まされない
won't end with just, can't be let off with
Noun / Plain form + では済まない / では済まされない
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では済まない says that something isn't enough to settle a matter, and the consequences will be more serious: 謝るだけでは済まない, "an apology alone won't settle this".
The first half is a light response or excuse: an apology, a joke, "I didn't know", a warning. The second half is often implied: there'll be a heavier punishment or responsibility.
では済まされない is the passive form, "can't be let off with": 冗談では済まされない, "this is no laughing matter". 知らなかったでは済まない is a common warning: "saying you didn't know won't cut it".
It's the opposite of で済む, "get away with, be settled by": 謝るだけで済んだ.
Examples
謝るだけでは済まない。
An apology alone won't settle this.
これは冗談では済まされない。
This is no laughing matter.
これは知らなかったでは済まない問題だ。
Saying you didn't know won't cut it for this.
今度遅刻したら、注意では済まないぞ。
Be late again and you'll get more than a warning.
世の中には、ごめんでは済まないこともある。
There are things in this world that sorry won't fix.