帮忙用英语写一篇网购退货的电子邮件

Dear Sir or Madam,

Thank you for your package, however, I am afraid the commodity does not serve the purpose I thought it would. Therefore, I have to ask for a refund with immediate effect.

I would arrange return of this commodity to your end soonest and I hope that you could arrange refund upon receipt of the returned package.

I apologize for any inconvenience caused.

Thank you for your understanding.

Yours Sincerely,
xxx

HI friend
This item not meet my expectation
I want to return it back
Thanks for your attention and help
regards
XXX