As the error states:
Please contact a Red Hat Network Sales associate.
If you have a problem with your Red Hat subscription you should contact Red Hat support. It has nothing to do Oracle and I'm afraid no one here will help you with it. RHEL is not a free product beyond its evaluation period.
Perhaps you might want to take advantage of Oracle Linux as mentioned in your previous discussion at https://forums.oracle.com/thread/2593755
Here are some more links that may help you to make the right decisions: