WCF charset=utf-8 of the response message does not match the content type of the binding (application/soap+xml; charset=utf-8)

I'm hosting a WCF service in IIS 7.5 using .NET 4.0. I also have a WPF application that I am using as my client that was built with Visual Studio 2010 and .NET 4.0. I added my service reference and when I attempt to call a function, I get the following exception

The content type application/xml; charset=utf-8 of the response message does not match the content type of the binding (application/soap+xml; charset=utf-8)

I am able to navigate to the service in a web browser and my bindings appear to be the same between the client and service (WsHttp bindings).

I know there are alot of google results about this error but none of them seemed to be relevant/help my specific problem. I tried installing Non-HTTP Activation features as well as a wide variety of other small tricks. Anybody be able to help? Thanks

edit, here are my configs (they are quite lengthy)

Client

<?xml version="1.0"?>
<configuration>
   <system.serviceModel>
      <bindings>
         <basicHttpBinding>
             <binding name="ContentSoap" 
                 closeTimeout="00:01:00" openTimeout="00:01:00"
                 receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"
                 bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" 
                 maxBufferSize="2147483647" maxBufferPoolSize="2147483647" 
                 maxReceivedMessageSize="2147483647"
                 messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
                 useDefaultWebProxy="true">
                <readerQuotas maxDepth="32" maxStringContentLength="8192" 
                              maxArrayLength="2147483647"
                              maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                <security mode="None">
                    <transport clientCredentialType="None" proxyCredentialType="Non