Heap Leaching Consulting interview questions

I was interviewed by the Engineer Manager. He told me that they needed a Metallurgist Engineer in order to attend to the Senior Project Manager in a scoping study project and also I would do both Process Engineer and Project Manager Assistant at the same time, sometimes. I fitted for the profile but neither I did know Piping design nor I did have the Certificate of Engineer (CIP number) therefore the manager told me that the salary was going to be lower and I would learn about this topic through the job routine meanwhile I was getting my Certificate of Engineer. When I started to work I received a lot of responsibilities that he did not tell me when I took the interview and I never learned about Piping Design either. I felt disappointed, so that I rejected the new contract that they offered me.