I wrote a few lines to IGG, here's the answer:

Thanks for writing in, and I’m sorry for the frustrating experience.

Perks are offers made and managed solely by campaigners. Indiegogo does not guarantee that campaigns will succeed or that perks will be delivered. However, campaigners are expected to be communicative and responsive to their backers. To help facilitate communication, here is the campaigner’s contact information:

Campaign Owner's Name: Michael Du
Campaign Owner's Email: michael.du@xmobiletech.com


Thank you for your understanding.

I'm not even expecting the t-shirt, but at least I asked them to close the campaing, somebody backed Youyota no more than a month ago.