poor relationship manager, and poor escalation of this issue

I was assigned a new relationship manager 6 months ago. the service has been appalling, but I am unable to escalate his poor service as there is no channel of communication. I called the business help desk who after 15 minutes advised that they were not allowed to give me the contact details of the area manger. I also logged a message on Facebook which has not been addressed. There is no support from FNB business, and I cannot get through to anyone for business advise, and cannot escalate the poor service anywhere. how is this possible. Alternatively, rather just tell me you do not want my business.