Unsatisfactory Service

So i have been trying to contact and get help from Ampath regarding my account, i have been receiving the outstanding amount emails and sms's from Ampath. so i called to find out why i was double billed for a blood test that the Referring Doctor requested be done once. I was told they would email me the proof that the doctor did in fact request twice. now i have been calling Ampath in hopes that I would get a resolution, however i have been hung up on twice and the 3rd transferred to Port Elizabeth branch, and was told they could not help as they were Admin- whatever that means. I must in fact call head office- the head office that trensferred me to them.