Support during upgrade from a version that has reached EOL

Will I get support if I am facing issues upgrading from a version of ES that has reached EOL to a version that is supported (like 5.0) in case we encounter issues?

What do you mean by "support"?

Will we get technical guidance/help if we call in to your support with an issue when upgrading from the EOL version?

We provide support around the process to upgrade to a version that is not EOL, yes.
We will also help to restore an EOL cluster that is not operational due to other issues, but there is no RCA provided.