有英语好的帮我翻几句话吗?谢谢

I sent my certifcate from the hospital to you two or three weeks ago, but so far I haven't received your reply. I want to know whether you could return my school tuition. Thank you.

I've sent you the proof certificated by hospital, but I didn't get your reply.

I want to know could you return me my tuition? Thanks.

I sent the hospital certificate two or three weeks ago, but I haven't received any message from you, I wander if you could return the tuition to me? Many thanks.