how to repair a samsung fast charger?

Hello, hey my fast charger from Samsung (the original white charger) came with an issue when I bought my Galaxy S7 , so what can I do? can I change it at any Samsung store or I need to buy a new one? because I would really like to fix it instead of changing it or buying a new one..... it´s being a couple of months since I bought it so I can´t return it just like that, Whats your opinion?????

Mostly they are not user servicable, throw away society etc... Samsung stores may replace it...
Remembering there is mains voltages in that white box, I wouldn't fiddle unless you have a good knowledge of electronics...