Drive against food adulteration
Tk 10 to 20 thousand is a minor chastisement for these businessmen as they earn as much each day.
If the law doesn't support the magistrate to fine them more than that amount I have a very good proposal.
Just publish the names of the convicted shops in a list on the newspapers once a month for the next one year as an advertisement of "Jonosharthe Bangladesh Sarkar" and ask people to buy foods from those shop at their own responsibility.
Or, put up a sticker or a banner in front of the shops writing, "This shop is facing the allegation of serving polluted foods" and compel the shop managers to hang them for six months.