Further more I discovered this transaction had been assigned a transaction number like all others, hence I called paymark for support. After an prolonged waiting of so called technical investigation, I received feedback today that is 1) not in my favor; 2) makes me doubt what current technology can actually achieve in our life.
With all respect to our biggest eftpos line company in the country, the result of my request really makes me feel like a joke, so I'd became nasty and asked for a written report. The call centre people hesitated, once again told me:
"During our investigation we can not find this transaction in our system at all, and in fact this transaction number you have is for an automatic logon that could occur during operation... ... I do not have therefore unable to provide the time this log on happened... ... since you can not supply a receipt either there is no other ways we could help you..."
In good faith I would this is all I deserve for been careless of conduct and entirely my own fault; however I really wonder how advanced today's technology is and why a more explicit feedback could not be given from the company.
If anyone in this forum is willing and knowledgeable to share insights about eftpos terminal technology, feel free to contribute your thoughts. For me it is a rather expensive lesson to learn but it's always good to learn. Thank you.