Is it only for a series?

@SamsungIndia from past 2 days I am facing problems with charging issues in my phone m31 as my charging is very very slow even if I use a fast charger and the maximum charging it is getting 75% after 6 to 7 hours of charge and I tried whatever the he...

I have m31 from past 2 days it's charging too slow that even charging for 15hrs it has reached only from 0 to 75%, what is the solution???