Customer service

Good afternoon. I have been having a problem, my subscription date is the 25th, I get paid the 31st or day of the month, now I get told because of arrears I can't change my date so every month for 5 days I'm without Internet which is ridiculous. No one can help when you phone it sounds like you are speaking to computers. I find your service ********** but won't change until my arrears are paid so have to stay with your bad customer service for the next few years because I can't afford to pay 2 providers.