Due to a lost phone, we decided to make the switch to a new mobile service provider. I didn't know it at the time, but we ported our numbers out 5 days into the new billing period with T-Mobile. A couple weeks later, they charged us for the full month's service. I called, saying that if they were going to charge us for the full month, they had to provide us with the service we were paying for (Netflix was included in our phone plan) to no avail. I then submitted a complaint to the BBB. A few days later, they reimbursed us a prorated portion of our bill.