Complaint about billing

Dear Xfinity Billing Department, I've been dealing with an ongoing issue that's causing me serious stress. I couldn't pay my bill, so you offered me an arrangement to defer payment until December eighth for seventy-four dollars seventy-six cents. Despite this, you've attempted to pull the payment twice, thankfully without overdraft fees since both failed. I called customer service each time, and both reps confirmed no further action would occur until the eighth. Yet, today I got an email demanding payment, which contradicts everything I've been told. This is unacceptable, especially after spending over an hour on hold with customer service. I need this stopped immediately and an explanation for why the system keeps ignoring my deferral agreement. I'm very unhappy with the service. Please resolve this and ensure no more attempts happen before December eighth. What steps will you take to fix this?