I see you claim that plagiarized posts have come from another user who is writing posts for you, but it will hardly be a good excuse that mod/admin gives you new chance. We know that one user who gets perma-ban is claimed that he bought his account after plagiarism has been committed, and admin intervened and remove the ban. In your case, it was really thoughtless that someone else wrote you posts without you checking them out before posting.
I have personally received several offers from some forum users to write posts for me in exchange for compensation, but it never occurred to me to accept something like that.
Also, Please have a look at this. **This was made after hilarious's reply
If you think that a ban should be ended, make your case in a new topic from a "good for the forum as a whole" perspective.
Also, As I said before I never intended to spam and admitted that it was solely mistaken on my side but it's up to the forum's admin to decide if this mistake is forgivable or not.
And all I'm asking for is a reply from admin or global moderator