Custom LED Neon Signs, Handmade Personalised Large Neon Lights Sign

We purchased a sign in December and the plug has shorted out is there away to purchase this separately?

How big are the actual letters in inches on a 55 inch sign?

Our sign turns on and when I touch the on button again it dims. But we cannot figure out how to turn it off or make it bright again w/o unplugging

On a 26” sign how many inches high is each letter?