The charge port is either damaged or dirty. Try carefully cleaning out with a toothbrush and blow hard into it. If it's not dirty it will need to go in for repair by changing the charging port. It gets damaged if you don't pull the charger out squarely.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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