麻烦各位帮我翻译下这句话：谢谢！

电话版（口头，非正式）：
Excuse me. I'm sorry to trouble you. We've sent a request to you before, but we haven't received any refundment yet. Thank you!

电邮版（书面，较正式）：
Dear XXX,
We're sorry to inform you that we haven't received any refundment yet, for we have sent you a request before.Thanks!
Best regards,
xxx

I'm sorry to trouble you ,I sent the request, but I haven't received the refundment.

Excuse me. I have sent an request before but no refund has been received yet. Thanks!

Excuse me. I have sent a request but I haven't received the refund yet. Thank you.