Not repaying interest

If you have cogent proof of lending money to your colleague then you may file money recovery suit against him else forget it.

Dear Client, In that situation, your case is strong actually you paid via online for more clarification you may contact us then I'll explain properly about your case.
Advocate Anurag Bhatt
Allahabad High Court
Mobile 9198889990

The interest you are charging towards the principal is very exorbitant and not tenable in law.

The chat messages or oral agreement for the interest portion cannot be enforced in court of law. 

An amount of Rs. 12500 cahrged towards interest for an amount of Rs. 1,15,000 and that too for two days alone is neither justified nor your claim will be entertained by court .

Besides he has repaid the major portion of the principal amount within 6 days of borrowing the amount, so any claim that you propose to make through court of law will incur you additional expenses but you will not get any relief, hence you better try to get back whatever he pays and do not lend to anyone in future especially do not become greedy to earn quick bucks which will prove fatal to your own program.

Since the borrower has already refunded the principle amount, forget interest, which is otherwise illegal.