When we originally started up our new company, we used the company name as the domain. However, we decided that it was too long and instead used something shorter. Then, we decided that was no good and finally settled on a domain for the long term. This was all in about a month's time.
The problem is that I set up a Google sitemap with the very first domain so Google immediately indexed that. Now, whenever someone searches our company name or anything else that we rank for, Google is returning the first domain name that we registered. Even if you search the current domain name, it still returns the old one.
I've since deleted the first sitemap and built the new one with the proper domain name.
How can I get Google to stop returning the old domain? It all goes to the same place, but I want to build a consistent domain so potential clients don't start getting confused.
It should be noted that these are both set up as addon domain names using shared hosting from an account I set up for a separate, primary business site.