Can I replace my charging port since it is not charging now?

It’s unfortunate that you don’t remember or understood what the shop told you because it was certainly important. If you feel like you are being bamboozled, ask them to explain it again…it’s usually important.

Yes, you can replace the charge port but based on the history of the device and the symptoms it exhibits, I would suspect something may be wrong with the charge circuit on the logic board. Of course, the first step in diagnosing this correctly is to try a replacement charge port. If you do it yourself, you will have to buy the part upfront. Another option is to find a reputable shop that does micro-soldering as they will be able to dig a little deeper.