Please always check the date:
[~snip~]
This topic about coinomi have been buried before you posted, now it's on the first page again.
I think old issues was completely solved.
I am using Coinomi wallet and until now never had any bad experience yet. So, I think the OP problem can be solved soon as he knows how to use the resync feature of Coinomi wallet. I experienced the same thing before if you can follow the guide from @HCP it should be work or simply use the resynchronize button, you can find this button at the right top of the screen the button looks 3 dots just touch it and you will find the resynchronize button.
Also, make sure that the Coinomi wallet is updated to the latest version before you follow the guides above.