ProSAFE 24 Port Smart Switch GS724Tv4 stopped working

Hello,

I own a ProSAFE 24 Port Gigabit Smart Switch (GS724Tv4) and two weeks ago, it stopped working. No light, no network.

I tried to use the chat support because it is registered and covered with a lifetime warranty, but I tried almost everyday since two weeks, at different hours, and I always got the message:

The chat queue is busy. Try again soon.

 So I also tried a few times to submit a hardware support request, but always got the message:

somethingWentWrong'

I did not find any phone number or other way to contact the support.

Thanks for your help.