hellooo my friend I am also facing this same problem...
I tried 3 Immigration offices with all document
First I went Madinath khalifa I tried two counter but no use they are asking me Housing contract. Other documents are ok
2. I went to Wakrah and they are saying me the basic salary should be 5000.
3. I went musaimeer, they check all the document and they told me the marriage certificate should be attested from Embassy and Ministry of Foreign Affairs
and now iam making that one,,,,
I think this is my bad luck because my friend got visit visa ...no attestation, no housing contract, basic salary
.....don't worry it will ok'''''''