Fast charging is not working

When I plug in my asus zenfone 6 it's not supporting fast charging it supports fast charging 1 out of 10 times even after switching off the phone and charging it is only working as a normal charging which take 5-6 hours. How should I solve this problem ?
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Comments
Could be that your cable is broken or your phone. Please try with other cables and if the issue remains, then please visit a service center
Plz suggest the website to buy asus 6z cable in India