Cancel NBN plan

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Level 1a
Hi there,
I would like to cancle my NBN plan at my old residential house because i am moving to new place where you guys dont provide nbn.
I have tried to message via online chat but nooone answered. Additionally i called 2days ago via your hotline number. I waited for nearly 1hr and they said someone would call me back but noone hasnt been in touch with me.
Please get back to me shortly. Thank you