I am in a serious situation with this *****ters called blazing auto

Hi pls I also have similar problem with this *****ters I sold them my Mercedes benz Aclass 2014 model for R175000. 00 and they also do an agreement with me of 3 times payment since November 2019. Pls I need help of anyone u know there where about to help or any information that can help me. I also introduce another friend of mine to them which they are also owing him almost R200,000.00. Anybody with information on how to get them will be highly appreciated