I cannot change my credit card details.

[Nyll Bergbahn]

There is a Jira on this issue https://jira.secondlife.com/browse/VWR-25777

I didn't read it all but looks like another bug in the local payment system. Suggest you contact Billing Support.

https://support.secondlife.com/billing-support/

There is no toll free number for Australia so you would need to phone the tolled US number (using Skype I suggest to keep costs down). Alternatively, submit a ticket https://support.secondlife.com/create-case/

If you wish, you can use an approved third party site to buy Lindens. I've seen VirWox recommended by a number of residents. https://www.virwox.com/

[Nyll Bergbahn]

There is a Jira on this issue https://jira.secondlife.com/browse/VWR-25777

I didn't read it all but looks like another bug in the local payment system. Suggest you contact Billing Support.

https://support.secondlife.com/billing-support/

There is no toll free number for Australia so you would need to phone the tolled US number (using Skype I suggest to keep costs down). Alternatively, submit a ticket https://support.secondlife.com/create-case/

If you wish, you can use an approved third party site to buy Lindens. I've seen VirWox recommended by a number of residents. https://www.virwox.com/