Charge peolpe for work not done.

This company doesn't know what they did on an engine. I had bought a bakkie and then asked them what they did to the engine as they didn't know but gave me the name and number of the company that worked on the engine. I then phone in to speak with Jason to find out and he told me he doesn't know so i checked the invoice and invoice said FORD 3.0WE MACHINE PARTS & SUB ASS this doesn't tell me anything in detail so i asked Jason and he told me i should go to and engineer to measure out the crank and block and head as he doesn't know. He then told me i was rude to ask him what he did on the engine. So i would suggest people to know what this company does they charge there client R28,572.33 to do nothing on the engine as he doesn't know so it means he did nothing on the engine. In future if you don't remember i would suggest you put it on the invoices you charge the people.