Getting 500 error while creating vertex using Rest API - rest

Question

I am writing a SSIS script component for importing data into orientdb using RestAPI but i am getting error 500. Please i am stuck here. Is there anyone who can help me with this. I am using version 2.1.7 community edition.
Here is my code so far.
Uri address = new Uri("http://localhost:2480//command/SQ-DB/sql/");
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
request.Method = "POST";
request.Accept = "application/json; charset=UTF-8";
request.ContentType = "application/json";
string username = "root";
string password = "***";
String encoded = System.Convert.ToBase64String(System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
request.Headers.Add("Authorization", "Basic " + encoded);
StringBuilder data = new StringBuilder();
// string link = "{\"statements\" : [ {\"statement\" : \"CREATE ( company: Accounts { Name:" + Row.companyname + "} ) RETURN company\"} ]}";
string link= "CREATE VERTEX Contacts CONTENT { 'name' : "+ Row.fullname+", 'Email' : "+ Row.emailaddress1+", 'Phone' : "+ Row.telephone1 + ", 'ContactId' : "+ Row.contactid+", 'City' : "+Row.address1city+"}" ;
data.Append(HttpUtility.UrlEncode(link));
// Create a byte array of the data we want to send
byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
// Set the content length in the request headers
request.ContentLength = byteData.Length;
request.Headers.Add("Accept-Encoding", "gzip,deflate");
using (Stream postStream = request.GetRequestStream())
{
postStream.Write(byteData, 0, byteData.Length);
}
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
Console.WriteLine(reader.ReadToEnd());
}
It will be a great help if anyone can point the issue. Thank you