I’m sorry, but I do want to point out, that even if they post the refund immediately, between their bank, and your bank, is generally why the 3-5 business days is in there, because they know there will be some delay between all of the involved parties.
Used to deal with this a lot on my old phone (micro usb) cleaning the port out helped a lot, but it is hard if you don’t have something thin enough to fit in, personally I used ESD tweezers I have on hand for electronics work, but even then I started having to do it once a week to get my phone to charge.