CRM 365: PowerObjects Web form to feed back data into CRM

Hi All

I would like to know if the functionality I am looking for can be done please.

Existing Functionality:

I am using PowerWebForm which I send in an email to my contacts for various purposes.

When the contact fill up the form, it will create new contact records in CRM.

Required Functionality:

When I send out a form to an existing contact to get their updated information, I would like that info to be feeded back to CRM. But at the moment PowebWebForm is not allowing me to do an update action in CRM as it thinks it is a duplicate record (or probably it can do only create action)

Can anyone help me in this please?

Thanks

Bab