There is no Tech Support anymore. Microsoft ended all of that in 2024.
Phone lines were closed over a decade ago. They used to have Live Chat and phone callback for some billing and account issues, but that no longer exists.
That is not really something CS can answer though. They don’t make the decisions on what Blizzard supports or does not support.
Google does provide me some info for you.
It appears your older game key can not be claimed and used through modern Battlenet. WHY, I don’t know.
Common Problems
* How do I install Warcraft II?
- Where can I find the installation for Warcraft: Humans & Orcs?
Some older game keys cannot be claimed via Battle.net. Customer Support is unable to swap these keys for the current Battle.net versions of the game or refund the purchase. If you have a Classic box version of the game with the physical CD, you can try installing directly from the disk. If you are unable to install directly from the disk, you can purchase the current version of the game through the Battle.net Shop.
HOWEVER there is hope if you use it with the GOG version! There is also some additional info on why you can’t claim the old key. Read this thread.
Note: MVPs are other players, not Blizzard staff. MVPs do not speak for, or represent, Blizzard.