Stop communicating with the sender and do not send any more money or disclose any more information.
If money may have left your account, contact your bank immediately using its official contact details. Keep the messages and transaction records, as they may be useful evidence.
Scams can be reported to Scamwatch. If money or personal information has been lost, ReportCyber provides the Australian reporting channel for cybercrime. If the message claims to be from Q Tech, contact us using the address published on this website.