+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
Why they are saying like that ?
As it's not a refusal nor approval !
Can anyone give me the contact number of immigration office of Canada so I can ask ?
As there is no contact number on their site !

It means they don't want to accept calls.
You have to send a case specific enquiry to clarify your status about your eTA application. Send your documentation, like birth certificate, passport and green card. It seems they made a mistake or you have a namesake that may be a Canadian citizen.
https://secure.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx

Here is the official answer on the CIC website about entering Canada on a green card:

http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=593&top=16
 
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Hi... i am getting the same problem. I am german citizen and eta was withdrawn that i am canadian citizen but i am not..
How did you fix it...???