How to delete customer contacts at the tables which is not seen in the UI

Summary:

For one of our customer, invoices are sent to email id's that are not in the distribution list as per customer account or site level contacts.

We found that Oracle is picking up these contacts from the table which can not been seen in front end/ UI. We only want to send the invoices to the contacts as per the account/site level. How do we delete these contacts at the tables so that it will not pick the contacts which is flowing from table.

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