TCS has a no questions asked warranty on their decoders.
That is the best in the industry.
So, what I get out of your message is, you're blaming Dallee because you shorted out the modules and burned them up, and Dallee has the gall to want to charge you for repairing them. Is that it?
In my 60-plus years of electronics experience I've never known of any company that offered to repair or replace an item free that was not defective when it left the factory and had been damaged by the end user, whether deliberate or accidental.