I know it's hard to help the OP with so little information, but if you feel so frustrated that you feel you have to insult him, that is against forum rules. I cleaned up the thread a little.
OP, if you could attach a couple of pictures of your controller, that would probably help.
I searched for KT-3 ebike display and found many hits
https://www.aliexpress.com/item/ebik...613010219.html