Hey Emile,
As this is a public forum it is honestly unlikely that you are going to be able to get in touch with that specific agent via this forum.
If you got a email from them their would normally be a "Get back in touch" button which you can use to get back to that agent.
Otherwise you could try contacting Telstra again and see if they can help you or are able to get a hold of that agent for you. (for NBN that would be 1800TFIBRE)
As this is a public forum it is honestly unlikely that you are going to be able to get in touch with that specific agent via this forum.
If you got a email from them their would normally be a "Get back in touch" button which you can use to get back to that agent.
Otherwise you could try contacting Telstra again and see if they can help you or are able to get a hold of that agent for you. (for NBN that would be 1800TFIBRE)