Still being debited for my cancelled subscription months later

I cancelled my subscription and received confirmation of cancellation on 13/05/2024. The router was collected on 07/06/2024. I was not in arrears and yet Rain has continued to debit my account. I was debited on 25/06/2025 and again on 25/07/2024. I contacted Rain and I was advised I am billed in arrears, which I disputed but still no feedback and my account continues to be debited.