Oh wow, just reading all this now, and wished this one had come up in my searches for answers for my phone previous to me taking to phone technician!
I had exactly the same experience as Zayn. The technician replaced the charging port, he had problems getting the phone apart and broke the screen ( had to wait again for parts as live in a regional area ) he paid for screen but after having trouble with another repair on a previous Sony of mine he has decided not to repair any Sony’s any more! So I am exactly in the same place, with phone slowly dying. I have ordered a new phone as I need it for my business asap. Will contact Sony to find out any experienced with Sony repair people as I love this phone. Any recommendations for Australia?