Hi there
If you like, I will try to guide you through it simply step by step.
If you would like this, could you please tell me what the equipment is and what you are wishing to achieve. I.E. is it a DVD RECORDER or just a PLAYER ?, if it is just a player it probably won't have aerial sockets. What inputs does TV have? Just simple terms will do. I know it has SCART, how many? Does it have an HDMI input too if so how many ? If you tell me the makes and models I should be able to look up this info online, if you're not sure.
Let me know..
Personally I am appalled by the service that you have received, possibly you need some extra leads which is why the engineer couldn't work it out as they often don't carry them on van even though they should.
Anyway shouldn't be too hard to fix !!! (I'm sure !! )