Unconfirmed and rejected transaction I am quite new to the Bitcoin world. About 1 BTC was sent from my Electrum wallet to my Coinomi wallet, with 0.5 mBTC per kB commission, and it remained unconfirmed for about 50-60 hours. Then the transaction was rejected.

Yet the amount  is still reflected as "unconfirmed" in my wallet. 
Two questions: 
1. What can I do about the "unconfirmed" amount. 
2. What did I do wrong and why it was rejected after all? 
Please help
Bitcoin network is heavily loaded with thousands transactions staying unconfirmed for a long time, your funds are totally safe with Coinomi.
Your transaction will eventually get confirmed or it will be "discarded" by the blockchain network and your funds will be back in your wallet. 
Unfortunatelly, there is nothing we can do to unstuck your tx.
To avoid such issues in the future you could increase the default fees for Bitcoin from Settings -> Transaction Fees.

You could also use a transaction accelerator such as https://www.viabtc.com/tools/txaccelerator/ or https://bitcointalk.org/index.php?topic=2204426.0

You could find more information about bitcoin fees through the link : https://bitcoinfees.21.co/

Coinomi Support