my inlaws family is not giving my IELTS certificate back after my divorced what should i do...we tried alot for this

Please contact nearest police station for the same.

Hi, Well I can suggest you to speak to the officials at either British Council or IDP, whosoever you registered with for the exam. And if you remember your registration number, I am sure they would help you with a duplicate score card on a requisite fee. Good Luck!