Additional fields disappeared in Appointments+

The additional fields we had have stopped working and in my Appointments+ settings I am receiving alerts saying that I should upgrade to Appointments+ to add extra fields. Now the only fields that work are those asking for name, email etc, I had additional fields which allowed the customer to enter their vehicle registration, model and make etc. We are a car repair garage. I am paying monthly for Appointments+

Can you get in touch to assist please?