Spare Charging Cable
Ask the customer if they have a spare charging cable available (excluding a 3-pin charger).
If the customer has a spare cable, instruct them to try using it to see if the issue persists.
If the spare cable works then advise the customer it appears to be a cable issue. If not, the issue is likely with the car and they can check the below:
Check the Car's Battery:
Review Car's App and Settings: