Lost pip appeal letter

If I request a mandatory reconsideration, I understand I can do it on the phone or in writing. If I did it on the phone(preferable since I'm short on time and what I want to say is in my earlier documents) will they contact me to discuss my reasons for reconsideration and explain why they think they are invalid\do not apply to me or will they just decide everything in my absence leaving an appeal the only way to get my points forward?

Thanks