I am trying to mass delete listviews from a test site using the workbench. Here is the destructivechanges.xml 

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <name>ListView</name>
        <members>Case.All_Open_Requests</members>
        <members>Case.All_Open_Requests_Since_2016</members>
        <members>Case.All_Request_Created_Today</members>
    </types>
    <version>44.0</version>
</Package>

Here is the package.xml 

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <version>44.0</version>
</Package>

Both of these are in a zip file changes.zip, and the workbench shows success but it is not deleted for the interface. What am I missing?