Hi and welcome to the forum.
So when and how did you contact Fairphone. Usually there is a response in that you will receive a ticket number. Are you saying you have not had any acknowledgment of that you have had no practicle advise, just the generic ~ we hope to get back in five days?
Regarding not being able to charge ~ check the following
- Using a magnifying glass check the usb port for debris and carefully remove any with a needle maybe
- Try other cables and chargers
- Does the LED light show red or yellow wehn you plug in the charger.
- Do a spin test on the battery to see if it is OK
- You can remove the bottom module and check it’s contacts are clean and making contact
- Whilst checing the bottom module check for water or dampness by checking the indicators.
The above with take some hours to check but then you may be waiting many days for anything usefull from Fairphone.
Search the forum for the issues I suggest here’s one that shows the water indicator 