We use the Present Perfect Tense to talk about an action which started in the past and continuous up to now. If you emailed something and have not received an answer yet, you can say "There has been no reply so far". Use Present Perfect when you have such words as ever, never, since, for, already, many times, before, so far, yet.
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clarenceI emailed their support on 6 Sep 2013. So far, there has been no reply as well.I assume by "support" you mean "support(ing) staff". "as well" is out of place. Other than that, the sentences are OK. I would write it like this:
clarenceI have been using "support" in my emails. Is it acceptable?Yes, provided you and your colleagues normally communicate with that terminology and you all understand what is meant by it.