My billing is Aug.12 - Sept.11. I bought a Samsung a5 phone which was an upgrade. I had no tab before this. The plan was $40 plus $15 tab. I bought the phone on Aug. 15. I returned it on Aug.16. I bought a prepaid phone instead and kept a $30 monthly plan. My bill came yesterday and it had the credit for my old number, the new monthly charge of $30 and another $30 monthly charge plus $15 tab charge. I don't know why i am charge 2 monthly charges plus a tab charge when i bought the phone outright.