Customer Service Issues - Payment Extension Granted then Rescinded after paying towards a NOW account as agreed

I've been overcharged for months when I should have been on the Internet Essentials plan at $29.95/mo.  Services were disconnected on a Sunday when both banks and customer service are closed.  I borrowed money to pay the erroneous and called customer service on Monday to rectify matters only to be told I wasn't on the Essentials plan and that I would receive a credit and be placed on the plan.  Well it happened again.  My services were disconnected on a Sunday and on Monday I was told my payment was not honored and it wasn't honored because I never received the credit and the amount they were trying to collect was still grossly wrong.  I was then told I needed to be without service for three months before being allowed on that plan which was never mentioned to me and didn't make any sense anyways.  I was then offered a prepaid NOW plan instead at $30/month which had to be paid now and that I would receive the new modem in 2-3 business days but they would grant me an extension on my existing account so I would have service until my new modem arrived.  I was told my services would be restored within the hour after I made payment but after almost 2 hours my services were still unrestored so I called back only to be told there was no payment arrangement and therefore I needed to make payment of the past due amount in order for my services to be restored.  When I called back the system automatically said "we see you have an extension through the 18th, would you like to make that payment now?"  I said no and was transferred as I stated.  This is CRAZY!  These departments aren't communicating with each other and if the calls are indeed recorded for quality control and assistance they certainly aren't utilized.  This is an attempt to reach the corporate office before I cancel everything and find another provider.  I can be reached directly at [Edited: "Personal Information"] or by email at [Edited: "Personal Information"].  I've already spent a total of 3.5 hours today dealing with this matter and I refuse to give anymore of my time and patience.