email to customer

I have to write an email to customer. Here my Draft, Please correct for me. Thanks a lot.
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Dear Ms. Mary,

My name is Anna. Ms.Katy and I have been appointed to follow Mr.John’s case. The old staff, that was responsible for case, have left the MH company.
The attachment document will be send to the Court. Please have your boss sign this document, and submit it as soon as you can.
I am looking forward to your response.
Thank you.
Anna

email to a customer

I have to write an email to a customer. Here is my Draft, Please correct for me. Thanks a lot.
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Dear Ms Mary
My name is Anna. I Myself and Ms.Katy are have been appointed to follow Mr.John’s case. The old previous member of staff who was responsible for this case have quitted has left the MH company.
The attachedment document will send be sent to Court. Please take get your boss’s executive officer's signature on this.
I am looking forward to receiving your returned early document.
Thank you.

Yours sincerely
Anna

email to customer

I have to write an email to customer. Here my Draft, Please correct for me. Thanks a lot.
----
Dear Ms Mary
My name is Anna. Ms.Katy and I are appointed to follow Mr.John’s case. The staff who were previously responsible for the case have left the MH company.
Please put your boss’s signature to the attached document, which will be sent to Court.
I look forward to receiving your early reply.
Thank you.
Anna

email to customer

I have to write an email to customer. Here my Draft, Please correct for me. Thanks a lot.
----
Dear Ms Mary
My name is Anna. Ms.Katy and I are appointed to follow Mr.John’s case. The old staff who was responsible for case have quitted the MH company.
The attachment document will be sent to the Court. Please to put your boss’s signature to the document.
I'm looking forward to your early document.
Thankful.
Anna