Blackberry Z10 Text Messaging Kills my Battery

Model : BlackBerry Z10 STL100-1
OS Version : 10.2.1.2141 (10.2.1.2102)
In the past few weeks I have noticed extreme and terrible drain happens to my device, Based on what the Device Manager shows me, Text Messaging is the main cause of that as it takes up most of the battery (from 60% and higher) and CPU usage even when I'm not using it at all.

According to some sayings, I did a search in the HUB and found out that there are many so-called "DELETED" messages still avail to be searched for, but they can't be deleted. I guess they're part of the cause.

Contacts do messed up in a hellish way that I got no choice but to filter them one by one.

Your concern and suggestions will be highly appreciated!

Regards,
Blackbearian

Honestly it sounds pretty messed up. I would probably do a security wipe and start fresh. Load back the apps and such after the wipe and see if you still have issues