英语翻译根据以下内容写一封投诉信.写信人：陈斌写信日期：2011年6月20日内容：1.本人于5月10日在贵商场买了一部手

Date: 20th of June, 2011
I have bought a cellphone from your mall on the 10th of May. However, the phone often turn off while being used. I have sent it to repair twice, but it doesn't work out. I would like to change it or refund it.
Best regards,
Chen Bin
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From：Chen Bin
Date:6.20.2011
Details:I bought a phone on 10.5 in your market.and the phone alwayse powered off.I have been to the store to fix for two times,but it had the same problem,so I hope you can request a refund or replacement
Thanks
希望能帮到你