editing auto invoice
If the organization's information in its Civi contact record is correct, then the next place I would look would be in the message templates (Administer > Communications > Message Templates, the templates for receipts are under System Workflow Messages).  You should be able to locate the information in those with a find - if you are not familiar with Smarty, however, be careful not to modify the code around the information as you might inadvertently break the template.  (It's probably a good idea to save the version currently in use before you start modifying, just in case you need to step back.)

Hope this helps,
Lesley