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VS 2017 Strange Characters in POST WebRequest Response

I'm posting a JSON web request and the everything seems to go through properly, but part of the response contains strange characters. I've tried a few different things, like changing the ContentType, but it hasn't fixed the issue.

For what it's worth, the host I'm connecting to states "The character set of all parameters is GB2312" and the return is by XML (Content-type:text/xml) in their documentation. I'm not sure this has any relevance towards my issue, though.

Here is my code
Code:

Dim postData As String = String.Empty
Dim request As WebRequest = WebRequest.Create("http://api.domainremoved.com/")
request.Method = "POST"
postData = "my=post&data=here"
Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
request.ContentType = "application/x-www-form-urlencoded"
request.ContentLength = byteArray.Length

Dim dataStream As Stream = request.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
dataStream.Close()

'HANDLE RESPONSE
Dim response As WebResponse = request.GetResponse()
Using dataStream1 As Stream = response.GetResponseStream()
    Dim reader As New StreamReader(dataStream1)
    responseFromServer = reader.ReadToEnd()
    reader.Close()
End Using
response.Close()

MsgBox(responseFromServer)

and here is what the response looks like
Code:

<?xml version="1.0" encoding="gb2312" ?>
<property xmlns="urn:sap:nicenic:params:xml:ns:sap-2.2.0">
<returncode>300</returncode><failreason>0000:�����֤ʧ��</failreason>
</property>

As you can see, everything looks good except one portion, the small portion after 0000:

Any idea what might be causing this or how I can fix it? I would really like to see the proper response being sent. Thanks in advance!

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