You can send an email to support at [email protected] or contact the admin here at bitcointalk forum, Bitcointalk ID: freeworm
You may also post your problem here at Bter official thread : https://bitcointalksearch.org/topic/annexchange-btercom-android-app-deposit-btsx-nowtweets-by-btercom-280806
You may also post your problem here at Bter official thread : https://bitcointalksearch.org/topic/annexchange-btercom-android-app-deposit-btsx-nowtweets-by-btercom-280806
On their "contact us" page https://bter.com/page/contacts, the email addresses are indeed @mail.bter.com rather than @bter.com.
I can't read it since their contact page is written in chinese. I found their support email address from its official thread here at https://bitcointalksearch.org/topic/annexchange-btercom-android-app-deposit-btsx-nowtweets-by-btercom-280806
