I have submitted my paper to a journal. I found out the journal is not as good as I expected, so I dropped an email to the editorial office two days after submission that I want to withdraw my paper. A week has passed since I dropped an email and I have not been answered and the paper has not been removed from the journal.
I want to submit the paper to another journal asap, but I am not sure that is polite behaviour; I think I should wait for the response of the journal. On the other hand, I was wondering what I should do if they don't respond to my mail.