Contact the installation partner who installed your charger. Installers know the process for replacing and returning a Peblar charger and handle it for you.
Send them a description of the problem and the serial number of the charger. If you have already been in contact with Peblar support, forward that conversation as well, so the case can be traced throughout the process.
Before you report a defect, it helps to check the error codes and to download the diagnostics of the charger.