Service Intergrity and Incompetence

After subscribing to the streaming service and paying by debit order, I reached a point where I wanted to suspend or stop the services for a period of time. After phoning in to cancel and/or stop the service, I was told to phone back on the day I wanted services terminated. I did that on the 30 August. The consultant said they could not cancel the debit order but if they changed me to a cash paying customer the debit order can be stopped and they duly did so. I would then ensure on the Monday that my services were indeed cancelled. However, the debit order did go off and now I am struggling to get a full refund of the debit order. They want to give me a partial refund. Why, I don't know?? I have asked to speak to supervisors or managers and then get put on hold until the call fails. I have been patient having phoned countless times now, but I have reached a point, exasperated by either incompetence and/or a "just don't care" attitude that I am not sure what else to do, other than publicly let people know my frustrations with them. If they went back and looked at how long I have been a customer, you would think they would have managed this better. Now they have just lost a life time customer.