marriage

[kipkip]

Hi
I applied to try to legalized my stay here in uk am an illegal immigrant, i leave with my partner who is british citizen, i applied last year november, but i have not heard from them, now my question is can i apply for COA so that we get married. we have one child with her,, I am also think to withdraw my application and go back home to tanzania and applie there, will i get ban for this?