You cannot charge via USB, you cannot connect via USB.
How do you know that the charging port is good?
It may look alright from the outside but it may be disconnected from the systemboard on the inside.
If you have tried different cables and different appropriate chargers and since you haven't specified how you know that the port is OK, then the tablet needs to be opened and the USB port tested to prove that is properly connected to the systemboard.
If it is loose or disconnected at all and as most probably it is a SMD (Surface Mounted Device) type USB connector, you will need the requisite tools and expertise to solder it back on. If you have never done SMD soldering before, I suggest that you contact a reputable, professional mobile phone repair service and ask for a quote for the repair. In the long run it may be cheaper than if you try do it yourself. You may cause more damage than what you had before you started, especially if you don't know how to do it.