Can you please contact CommVault Sales Account rep. ?
Each Maintainance Account is associating with CommCell ID as well.
If your previous employer deletes your account from Maintainance advantace as Account Administrator, you would be able to create another account, which is associating with different commcell otherwise we need to route through with proper channel to fix them all.
Hope that will helps.
Shinya ( Shaun ) Takagi / CommVault APJ Support Engineer