How do I prevent a domain from being pointed to a specific company?

If you only want to block it at one parking company but keep in rotation with the others, the best way is to blacklist it at that parking company. Log in to your Portfolio Manager account, click on Monetization to expand it and select the Blacklist Manager. Choose the service you want to block the domain(s) at and paste your domain(s) in the text box, one per line. Click Add. If you later want to remove them, simply follow the same steps but instead of clicking Add, you will click on the Remove option.