The only potential problem with the "It's your fault" angle, and your country's ministry of labour (or the applicable department) needs to guide you here, too, is that you said you had timekeeping issues. That led me to believe perhaps you were sacked from that job for cause. Meaning they had reason and documentation to justify having separated you from employment. If that reason had to do with "timekeeping issues" for which you were responsible, they're the ones with legal grounds to recoup their losses. Sounds like they also have the resources to keep working to do that, too, both legal and otherwise.

This is why you keep being urged to seek some guidance from your nearest labour ministry office or representative. So you can know what you'd be potentially risking by telling them to bugger off.