注文と違う品が送られてきました。交渉の結果、商品の交換とこちらからの送料の返金に応じてもらうことになりました。ところが返品すると知らせると、返品期間の30日を過ぎているので受け取れないという返事が来ました。これまでの経過からreturn policyは適応されないのではないかと書きたい。

To Customers Service Office
[name of the company]

This is [your name]
Order number:1234567

I am writing about my concerns.
As I have already reported to you that the goods you sent me on April 5 were not what I ordered. So I contacted you and you agreed to send me the right items. We also agreed that I would send back the wrong items  to you at a mailing cost would be covered by your side. I also reported that it would take some time for me to return the wrong item. You agreed with that as well.

However, today I was shocked to get the email from you saying that the return policy was within 30 days and my cancellation was invalid because of the time limit.  I contacted you and got an agreement from you within the 30 days.  As far as I understand, my case is special and not against the rules.

I am sending you the wrong order understanding that you will still be sending me the correct order.  I also ordered with the mailing costs covered by your side.

Just for your information:
My name:
The item I ordered:
The item to be sent back to you:
The return mailing charge:

Looking forward to getting the right items soon,

Sincerely,
[your name]