Account Suspended 2 Days Prior to Expiration of Payment Arrangment??

I am currently under a payment arrangement until Feb 8, 2017. Today is Feb 6, 2017 and at 2:33 PM CST my account was suspended. I called to inquire why and after a 20 minute hold period my call was disconnected. The next call involved many transfers and finally being told that I would need to call back when a supervisor was available followed by another disconnect (This was at 3:43 CST). The best part of the whole ordeal is that in the mail I received written confirmation (as well as email confirmation) from AT&T about the payment arrangement, in bold print was the promise, NOT to suspend service until after Feb 8th due to the arrangement. I've been a customer for over 10 year and this just seems ridiculous that during a small financial hardship and a promise to pay that I would be so abruptly disconnected. Plus the insult of all of the disconnected calls today.  While I would like to remain a customer and have actually already submitted payment for the past due amount as to not leave a balance I am currently in the process of looking for another wireless carrier.  Bottom line, this is just poor customer service and I'm very disappointed.