A very friendly lady contacted me regarding the yearly increase

A very friendly lady contacted me regarding the yearly increase. The only problem I have is that the caller speak so fast when explaining what all entails and inbetween she spoke about costs and benefits that I did not hear properly nor understand. But to be polite I only agreed on everything. It is very difficult for me to do business on the phone. I only what changes were made afterwards and the I try to rectify via e-mail. How do they deal with clients that cannot hear?