They cancelled the connection then deducted MONTHS of not using it

I have been using Rain(Internet Service Provider) for a few years with fantastic connection till I moved to a different location. I started having connection issues and sent them messages relating to those issues. Sometimes they would assist but, in most cases, no one comes back to me and one time they told me to cancel. Eventually I stopped using it since I struggled getting help. I was billed for that month and was told to make payment via WhatsApp. That was when I realized there’s an instant chat where I can raise my concerns and ask them to cancel for me. They said they would cancel but they didn’t till they expected me to pay for another month. I asked them how we got to a 2nd month when I cancelled. They said they would cancel but apparently didn’t again. Third month the same thing happened, and I told them I cannot be repeating myself over and over again, I am not even using their services plus because I haven’t been paying, they cancelled on their side while expecting me to pay. Today I realized there’s been a couple of debit orders that happened 4 times. Once again, I spoke to them and as usual they said they would escalate the matter. I tried reversing it, the bank says they are deducting straight from the card, and it cannot be reversed, they can only block it, even so Rain might find a way to still deduct some months later