@Anonymous User
Welcome to the forum. Unusual situation, when you press buttons on the remote does the white light on the front of the box blink? The black box doesn't have a wide IR field so you need to be pointing pretty much straight on to get it to register. There's also a rare issue with some older TVs emitting IR that interferes with the remote so try moving the box to a different place, eg the other side of and as far away from the TV as you can.
If still no luck try a hard reset by pushing a pin into the reset hole at the back of the box and holding until you see the box restart.
If all that fails it's possible the IR sensor on the box is faulty, it may need to be returned for a replacement,
