That is sufficient to send a legal notice. Send it and ask for payment of the other half within the 7 days of receipt of the notice failing which criminal proceedings will be initiated against him.
For further queries, you can contact me on email@example.com
I'll provide you certain legal suggestions, but for that i need to ask certain questions from you. For any further assistance, feel free to contact me on my e-mail "firstname.lastname@example.org"
Shubham Pabbi & Associates
The WhatsApp chats will do.
Please contact for help