The phrase 'Add insult to injury' means:

• Add insult to injury
English Meaning: act in a way that makes a bad situation worse.
Bangla Meaning: কাঁটা ঘায়ে নুনের ছিটা।

Others Option & Meaning:
• Achilles heel
English Meaning: a weakness or vulnerable point.
Bangla Meaning: দুর্বল বা ঝুঁকিপূর্ণ স্থান।

• A thorn in the flesh / A thorn in someone's side
English Meaning: 1. source of continual annoyance or trouble.
Bangla Meaning: সর্বদাই বিরক্তি বা সমস্যা উৎপাদনকারী

English Meaning: 2. a person or thing that repeatedly annoys someone or something or causes problems.
Bangla Meaning: কাবাবে হাড্ডি

• Apple of discord
English Meaning: matter of dispute / a subject of contention and envy.
Bangla Meaning: হিংসা - বিবাদের বিষয়

Source: Lecture