Arrogant service provision

I've been a customer for 30 years with the same telephone number. I paid account in December. New account arrived in Jan showing final payment date 31 Jan. I paid in full on 29th. Despite that I have been cut off ever since. Apparently there was an earlier amount which was late and the final payment date did not break down payment amounts for me to know this. Illogical. Unreasonable. The new automated system does not allow the client service agents to switch me back on. My home run business is suffering.