Netstar-promises but no delivery

Netstar has not been giving me the service I have wanted. And they billed me twice on the same account for months. Last year nivember I decided to cancel my subscription to go with another company. Their agents confirmed that I wanted to cancel. They did nit cancel the subscription, and continued billing me. The debit order would be reversed every time. Netstar decided to hand over my account for non-payment. They do do answer their phones when I call. How do I get jold of them? I refuse to be bul**** by a cpany who is not treating their clients with respect or providing the service they promise. I would like a call from a manager who will sort out the mess Netstar made. My name is Rene Conning. Contact me so we can sort this absolute mess out. And dont threaten me.