I'd also like to learn more about the Higher-Level Review. Is there a spot on your website where you keep a list of frequently asked questions?
Yes there is, Go to FAQs and there you can get answers to some of your questions
Can you please tell me on what should I expect if I request a call with a senior reviewer regarding my case?
Yes, you should expect a call at the phone number you gave them or the one your representative gave them on the Higher-Level Review form in which they will schedule a time to discuss your case with you.