Why isn't my ZTE phone showing new messages?

I do not remember what kind of ZTE it is. The version is 4.3 and model is Z797C. Anyways, the other day it was acting funny, and it wouldn't charge right on the phone charger in the car. So whenever I got home, I charged it as I normally do. Whenever i turned it back on, it told me the wrong time and the wrong date (like it was off by a long shot). And so I changed it, and now it isn't showing me the messages. It shows the messages in the notification bar, and who it is from. But whenever I go to look at the whole message, it just shows me the messages I sent before my phone died! Could someone help?