Call Java Web Service using C#

I'm using C# to call a Java Web Service.  I'm using Visual Studio 2015 The company gave me wsdl file and I generated the proxy class for wse 3.  I don't know WCF so I did it in wse 3

Here is my  app.config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
	<configSections>
		<section name="microsoft.web.services3" type="Microsoft.Web.Services3.Configuration.WebServicesConfiguration, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
	</configSections>
	<microsoft.web.services3>
		<security>
			<binarySecurityTokenManager>
				<add valueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3">
					<sessionKeyAlgorithm name="AES128" />
					<keyAlgorithm name="RSAOAEP" />
				</add>
			</binarySecurityTokenManager>
			<x509 storeLocation="CurrentUser" />
			<securityTokenManager>
				<add type="Microsoft.Web.Services3.Security.Tokens.EncryptedKeyTokenManager, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" namespace="http://www.w3.org/2001/04/xmlenc#" localName="EncryptedKey">
					<keyAlgorithm name="SHA2" />
				</add>
			</securityTokenManager>
		</security>
		<diagnostics>
			<trace enabled="true" input="InputTrace.webinfo" output="OutputTrace.webinfo" />
			<detailedErrors enabled="true" />
		</diagnostics>
		<policy fileName="wse3policyCache.config" />
		<messaging>
			<mtom clientMode="On" serverMode="always" />
		</messaging>
	</microsoft.web.services3>
	<appSettings>
		<add key="SaveWholeSoapMessage" value="true" />
	</appSettings>
</configuration>

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Here is my
wse3policyCache.config file

<policies xmlns="http://schemas.microsoft.com/wse/2005/06/policy">
	<extensions>
	<extension name="x509" type="Microsoft.Web.Services3.Design.X509TokenProvider, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
	<extension name="mutualCertificate10Security" type="Microsoft.Web.Services3.Design.MutualCertificate10Assertion, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
	<extension name="TESTPolicyAssertion" type="TESTWS.TESTPolicyAssertion, TESTWS" />
	</extensions>
	<policy name="esar">
	<mutualCertificate10Security establishSecurityContext="false" renewExpiredSecurityContext="false" requireSignatureConfirmation="false" messageProtectionOrder="SignBeforeEncrypt" requireDerivedKeys="false" ttlInSeconds="300">
		<clientToken>
			<x509 storeLocation="CurrentUser" storeName="My" findValue="xxxxxxxx" findType="FindBySubjectName" />
		</clientToken>
		<serviceToken>
			<x509 storeLocation="CurrentUser" storeName="AddressBook" findValue="xxxxxxxxx" findType="FindBySubjectName" />
		</serviceToken>
		<protection>
			<request signatureOptions="IncludeSoapBody" encryptBody="true" />
			<response signatureOptions="IncludeSoapBody" encryptBody="true" />
			<fault signatureOptions="" encryptBody="false" />
		</protection>
	</mutualCertificate10Security>
		<TESTPolicyAssertion/>
	</policy>
</policies>

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Part of the payload is an attachment of a text file.  The problem I'm having is that when I turn on mtom (<mtom clientMode="On" serverMode="always" />) I get the following error:
Error: Client found response content type of 'multipart/related; boundary="MIMEBoundary_aecb5c92eb42927b74b62c638a6f50e004008366aba1005a"; type="application/soap+xml"; start="<0.becb5c92eb42927b74b62c638a6f50e004008366aba1005a@apache.org>"; action="http://TEST/Transaction/Submission"', but expected 'application/soap+xml'.

If turn mtom to off I get this error:
<soap:Fault xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><axis2ns1:Code xmlns:axis2ns1="http://www.w3.org/2003/05/soap-envelope"><axis2ns1:Value>env:Sender</axis2ns1:Value></axis2ns1:Code><axis2ns1:Reason xmlns:axis2ns1="http://www.w3.org/2003/05/soap-envelope"><soap:Text xml:lang="en-US">SOAP Body does not contain the CAQH CORE Connectivity Element : Checksum</soap:Text></axis2ns1:Reason></soap:Fault>

So the error above is complaining that I did not attach the file.  I'm assuming.

Not sure how to exactly debug this error.  I'm a bit lost here.  I am able to test the web service using SOAP UI where I'm able to attach the file and everything is working.