Impossible to get any decent level of customer service

We have a corporate account No. B***-8 and I have been trying to cancel some contracts for 2 months now. I have been emailing and phoning and have had no response. When I email I get a reference number but no one comes back to me and when I phone I just get transferred to dept to dept and then told someone will phone me back but no one does. It is so frustrating and your corporate account services levels are abysmal.