What you should have in writing at each stage
The process should leave a paper trail, and you are entitled to it.
After the initial review, you should know what information is still missing and what needs an institution's judgment rather than ours. Your shortlist should name the awarding entity for each option and the material differences between them. Before submission, you should have a final document list and a chance to check what is being sent in your name. Before you pay or accept anything, you should have the offer, the full payment breakdown and the terms.
If something material is said only in a call or a message, ask for it in writing — particularly the awarding institution, the recognition position, total charges, any attendance or residency obligation, cancellation and refund responsibility, and how long the offer or price stands.