C-SP-390 Stopped working

I purchased this remote @2 June 2019 and one of the remotes just stopped working. Can I get help on how to fit this or a replacement. I was working great then stopped, we replaced the batteries 2x’s and no luck.

Can you check if the led on remote turns on solid & bright when pressed any button, after replaced battery?
This is to confirm remote is actually transmitting signals.

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