Are they both statement correct?
Why don't i get invitation?
Why i don't get invitation?
I forgot to invite one of my friend at my birthday today she said to me why don't i get invitation? Is it a right sentence

Question

Are they both statement correct?
Why don't i get invitation?
Why i don't get invitation? 
I forgot to invite one of my friend at my birthday today she said to me why don't i get invitation? Is it a right sentence

Answer

It's like Lorna said but you will also hear 'Why don't i get an invitation?' in spoken English.

Answer

I think 'Why didn't I get an invitation?' would be correct because for her to notice that she did not receive an invitation, the invitations must have already been dispersed.