bad payers

I write this on behalf of Masibule Winders.. on March 2019 we have done a job for Zana Manzi services, it was a joint job, they asked us to help them ..Qoutes were sent and we agreed on everything.The job was done in queenstown EC under Chrishani district.We hired some tools that were needed to do this job at our own cost.they are teling us that they have not receive the paymet from Chris hani which has nothing to do with us because we only had a deal with them not Chris hani the person who is in charge is Derick (***)..kindly please help us.