Recovery of money for the professional services already provided

i am an interior designer.taken a consultancy project of client big brother we had taken a project on consultancy basis in which my role is to provides drawing.monitary items and coordination between client and vendor.my fees is 28 thousnd Payment mode is set by the client side both the parties are agree. Materials samples are cheque by the client before project is started. On last stage is whn the work is completed client id deny to take our calls and messages and saying he will not pay balance 1.75 lacks of the vendor and 28 th of my consultancy.saying he had cross check the material and measurement for third vendor which is not in the entire scene from the day one. we are saying to give proof of ur statement bt he deny to do so. we had a valid proof of ever stage.ie vendor company bills to client ,Rtgs done by client side to vendor rtgs telephonic recordings is vendor is asking me for payment. i dt want my fees now bt what is the legal advisable solution for vendor