Hello,
Feedbacks cannot be removed by writing a post here. If your problem is resolved, you should write to your seller for sending a Feedback Revision Form. When seller send this form, you can revise the Feedback as Positive. It will be done . Very simple. If you write here, no person has right to remove the negative feedback.
In future, before leaving Negative Feeback to any seller, you should give the seller an opportunity of resolution so that seller can solve the problem if you are not satisfied. feedback is very important for a seller and Negative should be given under extreme cases where seller do not cooperate with buyer.
Thanks,