I ported my pre-paid service at Verizon to Tmobile on 1/17/2017. I paid a bill on 1/9/2017 which its cycle ends on 2/6/2017.
How do I get a refund for amount that is not used from 1/17 to 2/6?
I have paid $50.88 for the billing cycle so I would need 50.88 x (18/31) = $29.54 as my refund.