Thank you for contacting them.  The more of us who do, the better and it's likely to get a bit more attention.

I am not sure if this will change. I have been going through and adjusting dimensions to show the correct rate. It does not make sense as measurements I use are correct but it appears if you go over a certain dimension it no longer displays correctly.

Sadly, there doesn't seem to be any consistency with it affecting my dimensions. 😞

It has to change - if you do any basic search, it shows everyone's listings with ridiculous postage rates that do not conform to reality set by Australia Post.

That is has gone on for this long is outrageous.

I have just searched the terms and condition and found this 

The greater of the actual weight or cubic weight equivalent is taken to be the weight in determining the Charge for each Parcel.

Usually under 1kg they dont cube but reserve the right for larger items. This is what they are now applying to all parcels. 

So it does seam they have set maximum sizes for each weight but who knows if they will correct this. I have started going through 1000+ items and adjust them accordingly by having small dimensions and having the weight as the heavier of actual or cubed.

Yes, it's ridiculous atm. I just experimented with one of mine that since Friday has been showing as 'Local pick up only', unticked the local pick up box, but to no avail. It's still showing as 'Loaclsa pick up only' even though the box isn't ticked.  😡 So that was a total waste of time. 

How do you "call" eBay?  Or are you referring to chat, which is fairly useless at getting issues resolved?