Our direct contacts:

Email: support@exch.cx

SimpleX Chat (https://simplex.chat):

bitcointalk forum profile: eXch

While communication in English is preferred, we speak the following languages too: German, Spanish, Russian, Ukrainian

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Why no Telegram?

Our communications framework consists mainly of desktop applications and Telegram doesn't support end-to-end encryption ("Secret Chats") in their desktop app since the initial release, thus we consider transmission of payment and other private data via Telegram insecure, including using bots and standard chats, since neither of them support end-to-end encryption. We do not use mobile devices due to risks associated with a wide exposure of manufactory supply chains to hardware backdoors. More details can be found here https://github.com/marcovelon/tdesktop/blob/NoSecretChats/README.md and in the following discussion https://github.com/marcovelon/tdesktop/issues/2