How to undo updateRelatedRecords, there is no deleteRelatedRecords..

How to undo updateRelatedRecords, there is no deleteRelatedRecords..

The relation between a contact and a campaign is set using updateRelatedRecords. How can i undo this relation? I think there should be a deleteRelatedRecords function. Am i missing something?

https://www.zoho.com/crm/help/api/updaterelatedrecords.html

<Contacts><row no="1"><FL val="CONTACTID">9999999999</FL><FL val="member_status">Sent</FL></row></Contacts>

Regards..