People that do this are basically blackmailing their own employer. And you only have the leverage until you're replaced by a Perl script as the proverb says.

I see there's plenty of jobs in your country (I'm currently looking for employment myself in that same country). So, try another job, or try to have the upper-hand in your company by generating good business ideas and plans.
(At least, that's what I did at my previous company. Unfortunately, I got laid off during the cost-reducing phase they've had every few months. But my Perl code there is still running and doing good from what I see.)