how to sync my xbox slim wireless controller?

i play xbox all of the time, and have 3 wireless controllers. i just remodeled my room so i unplugged it and switched all my components into the (open) closet. today i tried to get onto my xbox, but none of my controllers will sync. yes, i have tried multiple times to sync by pressing both sync buttons, at the same time, at different times, right next to each other, holding them down, and whatnot. ive tried unplugging the console and taking out the batteries of the controllers. nothing is working. it just blinks and does not sync, i got my console about a month and a half ago. i cant find anything online to help me. help please :(.
p.s. telling me to return it or call customer support does not help me.
 
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