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The "Service Number" pertains to the Home phone number of the account that will be transferred to the new service owner.
On the page 2 of 3 of the COO forms, you just need to fill up the section "E" which is the "Direct Debit Payment Details".
After accomplishing the form, please send the form via fax 02 9850 0813 or send it as an attachment (PDF) via email to firstname.lastname@example.org.
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