Want to Change NBN

Level 2

I want to change my NBN plan but can't do it due to some thread in account. I am getting below error. Cusotmer service and plan change team can't resolve this issue since last week. Any suggestion please. 

We need internet asap due to work from home.


Unfortunately there was an unexpected error when submitting your registration.
We apologise for the inconvenience caused.
Please contact TPG Customer Service on 13 14 23 for further assistance.
When contacting TPG, please quote this error code: < E:adsl_comm:thread_exists >