Vendor has taken the goods and is not paying for the goods

We are an electronics refurbishing company and we have given the goods to a vendor many times from december and January but from the last lot of devices given to the vendor in January, vendor owen us payment. Everytime we ask him for payment, he evades by saying he will do it soon and sometimes he doesnt even respond to the calls and sometimes angrily responds. The amount is a big one and he says he is keeping part of the profits we made. Please help us. He is a Muslim dealer with big contacts. We believe he sold the devices and is holding the payment. He isnt even returning the stock unsold.