Here's the last bit again (hopefully without the unfortunate formatting):

Hello Nicolette,

Thank you for your reply and I do appreciate your efforts.
However, your online postage calculator still delivers the wrong result.
This is not a matter of a simple local adjustment to EPOS at Browns Plains as you indicated.
This would appear to be a widespread systemic failure of the EPOS system which, I would suspect, is Australia wide.
As I pointed out to your colleague Leon, the EPOS system is in fact just one front end of a database (Db).
This Db was originally programmed to look up a table as all Db's do.
The reference table in question, I strongly suspect, is a list of postcodes sorted by zone.
Your new paradigm for local(ish) postage however, ignores zone boundaries up to 50km.
This would contraindicate the use of any previously existing reference table.
If this problem has not already been referred to your IT department then a serious oversight has occurred.
Only users close to zone edges (within 50km) will be affected by this but you do have many zones and many customers.
In particular, businesses and individuals close to cities but in different zones are severely affected.
In my case we could think Brisbane/Ipswich for example which are both centres containing large populations.
Based on your documented pricing advice, this problem could result in an overcharge of between 90c and $19.80 per parcel to anyone using the parcel service under the circumstances previously described.
The new pricing arrangement has been in place for 2 weeks now and, as far as I can tell, this problem with EPOS has not been adequately addressed.
This problem is the subject of discussion on several online retailing forums at present and AP's response to the issue is being very closely observed.
If I have not received an adequate response as to how AP intends to correct this anomaly within 7 days I will have no alternative than to escalate the matter to a formal complaint with both the ACCC and Qld Fairtrading.
I sincerely hope it will not come to that.

Kind regards