How to update csv file

How to update csv file at specific column?

Kantu can not update csv and colums can only add line in csv

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i have a csv file with user info, and i want to add these info in CRM and add Contact ID in csv.
I have completed to read csv file and add contact to CRM.
Now how can i achieve to update csv file of specific column/index?

You must use csvsave to save data in csv