var soapEnv =
            "<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/'>
                <soapenv:Body>
                <GetListItems xmlns='http://schemas.microsoft.com/sharepoint/soap/'>
                    <listName>Tasks</listName>
                    <query><Query><Where><And><Neq><FieldRef Name='Status'/><Value Type='Choice'>Completed</Value></Neq></And><And><Neq><FieldRef Name='Status' /><Value Type='Choice'>Waiting for Inputs</Value></Neq><Neq><FieldRef Name='Status' /><Value Type='Choice'>On Hold</Value></Neq></And></Where></Query></query>
                    <viewFields>
                        <ViewFields>
                            <FieldRef Name='Title' />
                            <FieldRef Name='Status' />
                             <FieldRef Name='DueDate' />
                        </ViewFields>
                    </viewFields>
                </GetListItems>
                </soapenv:Body>
                </soapenv:Envelope>";

    $.ajax({

        url: url + prjName + "/_vti_bin/lists.asmx",
        type: "POST",
        dataType: "xml",
        data: soapEnv,
        complete: processResult,
        contentType: "text/xml; charset="utf-8""
    });

<Where>
    <And>
        <Neq>
            <FieldRef Name='Status'/><Value Type='Choice'>Completed</Value>
        </Neq>
        <And>
            <Neq>
                <FieldRef Name='Status' /><Value Type='Choice'>Waiting for Inputs</Value>
            </Neq>
            <Neq>
                <FieldRef Name='Status' /><Value Type='Choice'>On Hold</Value>
            </Neq>
        </And>
    </And>
</Where>