I confirmed with my colleague,they already sent you the RMA NO,you just need to ship your light to our repair center,we will check and repair it for you.My colleague is still waiting for your shipping information.
If it's not the driver problem,then it will be the protection tube which beside the leds problem.
When you replaced the leds by yourself,you may not find the problem for the protection tube.Sometimes one of them have problem,the whole light won't work.
You can send your light to our repair center,we will check for you and repair it.Or you can find a Multimeter to check the leds one by one to find out which diodes have problem.
This kind of situation happend many times to our customer before.