Metro by T-Mobile

I bought a Metro PCS phone with the one month service plan of $45. I didn't pay for the next month due to financial reasons. I thought this was a month to month plan after disconnection you can pay again for services for that month. They called and asked for two months payment after I had already paid for that month. They threatened to cut the phone off after having it on for 13 days. I paid for the whole month. After arguing with them, I said you haven't even prorated the month I've paid for, so how can you disconnect my phone. After putting me on hold, then they agreed to the prorated amount asking me just to pay $14.00. I agreed, but then I thought about it and didn't. For one, I didn't agree to any plan that tells me when, or how to pay. I bought the phone and the service at a local gas station. They still disconnected my phone after paying the full amount.