Won’t credit payments to my account

So I pay around $300 a month for my wireless services. I have always paid on time. For October I set auto draft for the payment by accident. It returned so I paid the balance, 305 in two different pAyments the next week. That was three weeks ago. I have called four times and no one can tell me why the payment hasn’t been credited. They keep saying that it will be.[Per Guidelines:  Keep it Relevant and Appropriate].

Nancy [edited for privacy-please do not post personal or unique information such as but not limited to full names, employee ID numbers, email addresses, phone numbers, account numbers, etc.]