Decrypting with private key and public key is missing

[Guru_i]

Hi Im using GPG CL 1.4.9. 
case is - 
1)somebody (trusted) is generating key pair on my behalf(as proxy). But he
is sending me only my secret key and NOT public key. 
2) I was able to import the secret key in gpg keyring using
--allow-secret-key-import command
3) But when I try to decrypt the file (which was encrypted using my public
key its not with me though) I get error message such as 

gpg: decryption failed: secret key not available. Though I know I have
secret key with me.

Please help
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