inefficacy of late repentance

فَمَا كَانَ دَعْوَىٰهُمْ إِذْ جَآءَهُم بَأْسُنَآ إِلَّآ أَن قَالُوٓا۟ إِنَّا كُنَّا ظَـٰلِمِينَ

And their declaration when Our punishment came to them was only that they said, "Indeed, we were wrongdoers!"