I am Samuel and I can help you with this!
Is the phone on currently?
When you plug it in does it make a noise indicating a connection?
Do you have another charger to test with?
With the charger plugged in is there any play or wiggle in the port?
If at any point you would prefer me to call you directly I can. Other wise I am glad to try and help via chat!
I am a phone expert so I don't have anything to do with billing but you can request a refund with in your settings! I hope you get things solved!