I am trying to see what do we have in common in an attempt to find the root-cause. Does your record show degree attested before? as yes? also, does it mention stamp number? Mine doesn't. Maybe this is the reason they weren't able to verify?
Mine attestation doesn't reflect stamp # and in " before attested it shows "No". HEC has changed the portal to Eservice.hec.org from eportal.hec.org . Now it shows all details of attestation along with stamp # of original degree as well as photocopies.
I asked detail reasons for not accepting documents from WES through online customer service. See what they had replied.
"Thank you for choosing World Education Services (WES).
Reason: The document received was not properly verified in the manner required by WES.
Instructions: Please resubmit the academic document according to the Required Documents as stated for your country of education."
AS HEC has changed the portal as well, it think we will have to resubmit the documents in any case.