C# SoapException: How to Configure Xml Output

I have a C# WCF Service and its working with goverment. The goverment is waiting SoapException in some situations but exactly in the schema (format) below. And I don't know how to do it.

<soap:Envelope xmlns:soap="http://ift.tt/18hkEkn"> [^]
    <soap:Header/>
    <soap:Body>
        <soap:Fault>
        <env:Code xmlns:env="http://ift.tt/18hkEkn"> [^]
            <soap:Value>soap:Receiver</soap:Value>
        </env:Code>
        <env:Reason xmlns:env="http://ift.tt/18hkEkn"> [^]
            <soap:Text xml:lang="en-US">XXXXXXSOMEVALUE</soap:Text>
        </env:Reason>
        <env:Role xmlns:env="http://ift.tt/18hkEkn"/> [^]
        <env:Detail xmlns:env="http://ift.tt/18hkEkn"> [^]
            <ns3:EFaturaFault xmlns:ns3="http://ift.tt/1dtSkdA" [^] xmlns:xmime="http://ift.tt/1leiEyB"> [^]
                <code>XXXXXXSOMEVALUE</code>
                <msg>XXXXXXSOMEVALUE</msg>
            </ns3:EFaturaFault>
        </env:Detail>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>