Went thru the same deal, but with Stack-On now Alpha-Guardian. How did they identify which key your safe had? I was told no key without a model/serial number.
My safe had a 1-2-3-4 code from the factory that woke up the digital face, but I had access to the inside and put new batteries. After that I was able to enter a new owner code. Still, was unwilling to depend on the digital lock only and no key. That is why I replaced the lock with another one with keys. If yours is dead, don't know what you can do unless you can get keys from the mfg.
'16 40QBH Phaeton
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten