Immigration Officer called to ask if I want him to decline my application for a residency visa, He explained that this will be a waste of time if I want to keep going on as he will decline my application anyway at the end. Is it legal to do so? sounds unusual to me.I did not give him an answer but he said I have to call him tomorrow to give an answer. The reason was I submitted the application 1 month earlier before we started living together, But this has been explained already as my mistake.

It has been 13 months now since I applied for Residency Visa in Partnership Catagories.
Is there any reason why he called me on the phone to ask me instead of just decline my application by email? And what should i say to him?

Please advise,
Thank you