I am an international student living in the US, I applied online for a visitor visa and I was rejected because I did not upload my I-20. I am confused because it was not one of the documents required when I submitted my application, I uploaded all the required documents. I am trying to reach the CIC office but I have not found any useful phone number or email. I contacted VAC in New York and they said they don't handle online applications, so who do I contact?