Hello Marumo,
Might you be able to send us a photo of it? The more info we have the better we can help you.
I may also take this moment to remind you, the description of your phone states ++low-budget++. Cheap appliances often spontaneously decide to break.
Do you think the screen might be dirty? Try taking a cloth and putting hand sanitiser or glass cleaner on it and wiping the screen clean with it until it all dries up.
Let me know how this does.
Falcon16