Rebate

When I signed up for Hughes Net I was told I could apply for a $100 rebate after 2 complete months of billing.  I ordered in March of 2019.  It was my understanding that the first billing cycle was a short month.  So that would put me into June when I would be able to request a rebate.  I went in today to request it and I can't get to the form to fill out.  It wants me to sign in with my email account and password.  I use the email account that I have gotten emails on and it says it isn't a valid email.  I don't even know what my hughesnet email account is because I never set it up.

How do I get to the rebate form?