Why is my battery life decreasing when charging?

I have a samsung galaxy note 8.0 tablet and i just got it back from having the screen fixed from a local store here with great reviews.

But when i plug it into the wall charger,it doesnt seem like it charges,i used to be able to use it and it'd charge within a few hours but now it doesnt seem to be moving at all.

It's been almost a whole day and it went from 38% to 41% and when i tried using it it went to 24%. i read and people said it's the battery or the cable/usb charger.

i already spent so much repairing the glass screen,is this a quick fix or a major cost?
i only sent it in to be fixed cause it looked ugly and i like it perfect when i draw,the lcd and touch screen worked fine.
the repair store wouldnt have broken it any way right?when i got it back it was still charged.where it plugs into the wall charger it is extremely hot.

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