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Rebtoncton (으)로 부터 도착한메세지 - English

Using my English in a real situation.
Hi!
I have to send a message to a ebay seller and I'm taking the opportunity to practice my English as well.
I think they'll understand me, however I'd like to know if there are mistakes in my text and how a native would say that.
Feel to give me your suggestions!
:) Message: "The ebay was showing my product as delivered, then I've opened a case.
One month after that I had not received my product yet, then you've refunded me.
Turns out I just got my item and the case is already closed, so how must I proceed to make a new payment?"

제목
- Using my English in a real situation.
  투표하세요!
- ADD a NEW CORRECTION! - 제목
문장 1
- Hi!
  투표하세요!
- ADD a NEW CORRECTION! - 문장 1
문장 2
- I have to send a message to a ebay seller and I'm taking the opportunity to practice my English as well.
  투표하세요!
- ADD a NEW CORRECTION! - 문장 2
문장 3
- I think they'll understand me, however I'd like to know if there are mistakes in my text and how a native would say that.
  투표하세요!
- ADD a NEW CORRECTION! - 문장 3
문장 4
- Feel to give me your suggestions!
  투표하세요!
- ADD a NEW CORRECTION! - 문장 4
문장 5
- :) Message: "The ebay was showing my product as delivered, then I've opened a case.
  투표하세요!
- ADD a NEW CORRECTION! - 문장 5
문장 6
- One month after that I had not received my product yet, then you've refunded me.
  투표하세요!
- ADD a NEW CORRECTION! - 문장 6
문장 7
- Turns out I just got my item and the case is already closed, so how must I proceed to make a new payment?"
  투표하세요!
- ADD a NEW CORRECTION! - 문장 7