Fraud done by client

I am an interior designer based in delhi.Recently i had taken project for one of my previous client brother for some institute renovation work.i was hired on consultancy basis.in which my role is to provide consultancy and cordination between the client and the vendors.All vendors are provided on my behalf.as client dont have.all payment mode is set by client side mutually agree by both parties and material is check by clent itself.before work is started.client had set 4 stages of payment.4th stage final payment is to be done after work is completed.now wen the work is completed he deny to make payment of 1.75 lack of vendors and also my consultancy which is 28 thousand is not paid by them.he is making excuse ie i had a material check and measurment check from another vendor.their vendor said its poor quality material but whn we ask them to talk or set a metting time.give proof of ur statement.he deny.and stop taking our calls and answering messes and saying they will not give any payment now.not even my consultancy we have a valid proof of every part.ie vendors comapny bills,rtgs payment telephonic records etc.now vendor is harassing me to give paymnt on my behalf..what is legal procedure for that. as i dont take a turnkey project.its only the contact basis project in which contacter is provided by me.bt payment is done by client itself.