Regarding the follow-up (after-sale) service problem I (we) mentioned in the last email, I (we) no longer need you to provide anything.
As it is mentioned about the after-sale service in the last email, it's no need you to reoffer any more .
You donnot need to provide something anymore according to the problem of After-Sale Service mentioned in last mail.
The problem of after service mentioned in my last email, I don't need you to provide anything more.
You don't have to provide anything more regarding the after service mentioned in last email.