Four times in ten it is lint. Book the bench diagnosis and let somebody look before you buy a part.
A phone that will not charge is the second most common thing that comes across this counter, and people arrive having already decided it needs a new port. Perhaps four times in ten it does not.
The first reason, and the commonest, is a port packed solid with a year of pocket lint. The cable feels like it is in, the pins are not touching anything, and the phone is perfectly healthy. Taking it out properly is a bench job with a wooden pick and a light, ten careful minutes, and it costs the bench fee and nothing else. We hand people the little grey plug of felt afterwards and they never believe it came out of their own phone.
The second reason is the cable and the plug, not the phone at all. A cable that has been bent at the same place for two years has broken conductors inside an intact looking sleeve. Try another cable and another plug before you book anything; if a different cable works, you have saved yourself an afternoon.
The third reason is a port that has really failed, usually from being charged with the cable at an angle while the phone was in a pocket or on a bed. That one is a real repair: the old port has to come off the board without lifting the pads underneath it, and that is soldered work on the back bench, ninety minutes, and it is where a cheap repair turns an eighty rufiyaa fault into a board nobody can fix.
There is a fourth thing that is not charging at all. A battery at the end of its life reads thirty percent, drops to nothing, and will not start in the morning until it has sat on the charger, and people read that as a charging fault. It is a battery, it is forty minutes, and we will show you the old one.
So the honest advice is the boring advice: try another cable, then book the bench diagnosis rather than a repair. Thirty minutes, a written answer, and the fee comes off the repair if there turns out to be one.