Reconnection fee doubled after 24 hours of no service

I scheduled a payment arrangement for ~$350, but when I realized I wouldn't recieve the money for it in time, I changed the payment date to the 27th and the amount to ~$700 to cover the whole bill. I did this using the app and it showed no issues and that it was within the allowed time frame for uninterrupted service. I woke yesterday to no service, but assumed it was an outage as I hadn't received a message from xfinity and we've been having storms and work done around the power lines. I went to check the app, and discovered my service was suspended and I needed to pay ~$350 to restore it. I've been scrambling and managed to cobble the fee together early this morning. Today, after 24 hours of no service, I received a message about my service being interrupted for non-payment. When I clicked the link to pay, the fee was now ~$700 that I want have until the 27th that I've already had set up on the payment arrangement. I'm frustrated at this point, as this is not the first time this has happened when trying to use the arrangement schedule, though it is the first time the bill has doubled after only 24 hours of service interruption.