On November 26 I saw Sony camera cashback activity from currys, so I decided to buy a Sony digital compact camera. Registration and application for cash back activities were conducted on the official website on 11/26/2017. Because it is purchased online, there is no paper invoice. The first email replied by sony told me that they did not receive a valid invoice (12/05/2017). I found the electronic version of the invoice from the mailbox. So I sent that to Sony. I thought this time should be able to get cash back, but after two weeks, the email I got from sony said that I missed the deadline to participate in cash back activities. I immediately sent another e-mail and call the relevant staff. The answer was that they did receive the mail but the invoice could not be opened. I went to the local currys shop and got the receipt, So once again I sent out the required documents for the event on December 21, unfortunately on January 9, 2018, they notified me that it was too late to participate in the event. The reason is more interesting, they did not receive any email on 21th. . . Ha ha. . . The email I sent out is still in my mail box, E-mail sending status is successful. How could they not receive my email? The cash back activity seems a joke for me. Share my experience for you, sad and disappointed!hope you can get the cashback.