This morning a friend sent me bitcoin from another exchange - he has done this before with no issue. Today at one stage the luno site did give me a message saying that there were 2 out of 3 confirmations. Then the app on my mobile phone crashed and had to restart, when it was done there were no coins in my wallet, no error messages, nothing in my transaction history - basically no trace. I checked this on both the app and website. On the other exchange it lists the transaction as successful and took the coins out of his wallet there. I am worried that these coins have now been lost on luno, please help me with this.