Pago de factura

Hola,

I would like to pay the mobile bill of another line that was added to my account.It is kind of add-on i.e. additional line and this is the first bill whic I was trying to pay. I could see something that is showing up of $100 but not sure what is this? And why It was showing $100?

 I have already paid primary line but I was trying to pay the new line that was added recently to my account.

Kindly suggest.