@gates321 OK - so I'm guessing you already know that VFS is not applicable and you should apply to the Embassy of Portugal in Ankara - and that that's what you're trying and failing to make progress on?
My own (very personal and layperson) reading of the procedures is that for the particular type of residence permit applicable to the D7 you mentioned, you can't apply for it after arrival without that visa.
I'm not convinced about what type of visa you actually require in your circs, but it's certainly true that you could engage in freelance or self-employment with that visa once officially in Portugal, should you qualify via the D7. There are others that might serve equally well or better, depending on what it is you're intending to do.