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Unable to change my NBN plan

Level 1a
Hi, I'm trying to change my NBN plan from the 'NBN12 100GB data' to the 'NBN12 UNLIMITED data' plan but I get this message: Unfortunately there was an unexpected error when submitting your registration. And this error code: < E:adsl_comm:thread_exists >. I would appreciate any help in understanding what this means and why this is happening when it is supposed to be easy to change plans. Thanks.

Hi @CalB,


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