15-25W charger is considered super fast. 45W is considered super fast 2.0, and super fast 2.0 needs a different cable or all you'll get is 25W max.
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So eventually I had to send my phone to Samsung repair where they had to replace PBA and camera dust. Not sure what camera dust repair is but somehow it failed in testing and hence got repaired...
Got my phone back yesterday and now I have super fast & fast charging...