Delete Subscribers using POST not DELETE method

I am unable to implement the DELETE method as it is not supported by Delphi 7
I can use POST and GET

I was wondering if there is a alternative method of Deleting a Subscriber similar to the unsubscribe method ?

eg  POST https//xxxxxx.createsend.com/api/V3.1/subscribers/list_id/delete.xml

      Unsubscribe is
      POST https//xxxxxx.createsend.com/api/V3.1/subscribers/list_id/unsubscribe.xml

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