I want to know if "Could u reach that complex guy?"is right or wrong

It's right if he really is

A friend wanted to know if I were was able to contact a client ...

Brings up an interesting q, JTT. "Were" seems to ask merely if I possessed the capability whereas ""was" asks whether I actually did so

However Jam is asking whether "Could u reach that complex guy?" is right or wrong

A friend wanted to know if I were able to contact a client and he used "Could u reach that complex guy?", so I want to know if that's grammatically correct.

I believe, as I see the situation, that 'were' is not semantically or grammatically possible here, Dale. This is not a hypothetical situation. It describes, again, as I see it, a real situation. Note the "friend wanted to know" & also "and he used ... ".

What does "complex" mean?

Is it the name of a company? Or is this person of a complexing personality?

Asking, "Could you reach that complex guy" is grammatically correct but probably not proper for the office.

Shouldn't you understand what is meant before you deem this "probably not proper for the office", Punkey?

It's perfectly fine for the office or for Congress or Parliament or anywhere. For SWE it may well be an idea to consider some other form.

Listen to how people talk at the office. In many situations it's highly informal.