Call centre, Chatbot and selfservice website - problem still not resolved!!!

Their service delivery is shocking. No one answers the call centre number no matter the amount of times you try calling their number. The call centre prompts are not user friendly at all. The self service website also doesn't allow you to cancel any debit order you might still have even after you cancelled your subscription over 3 years ago with them. For years you don't hear from them and then suddenly they just go and debit your account and there is no way of stopping them because their phone lines don't work and none of the other options they have are helpful at all. Still no way of resolving the matter.