I purchased new phone in Dec and was told I had to pay tab for three months before it could be paid in full which I did on Apr.3 269.70 Plus my regular bill of 78.69. My May bill should be back to normal of 55.49 but instead they took another 78.69 out of the Tab payment. All I should owe this month is regular bill of 55.49. Called and got a robot that said I would be charged $10 for any changes to my account. Can someone please help me?