IS MY 1ST PAYMENT IN ADVANCE INCLUDED IN THE AMOUNT I’M IN CREDIT ?
IS MY 1ST PAYMENT IN ADVANCE INCLUDED IN THE AMOUNT I'M IN CREDIT ?
Purely as another customer. Your first payment wont take into account any credit, this is basically because your first advance payment is taken on the day of your switch whereas any credit wont be added to your account until after your switch.
For subsequent payments any credit can be taken into account.