Disgusted in client services

Vitalaire, an oxygen hire company say on their statement that they will ask for preauthorization and will claim directly from my medical aid and therefore not to worry. Now I have been handed over to Ncube incorporated, a debt collection attorney. I do not believe that the supplier asked for preauthorization and did not send a claim to my medical aid for payment. I have queried this with the debt attorneys, and I have not received a reply at all for the last 2 years and have sent them ten emails requesting proof that preauthorization and claims were submitted and still no reply. Ncube attorneys phone and harass me twice a day every day, even though I keep telling them to communicate with me, only via email or SMS. I do not answer the phone anymore because I want them to converse with me in writing. I know that they say on the statement that I am responsible for the account, but if I knew the medical aid was not going to give preauthorization and obviously, the claims would not be paid, I would not have hired oxygen from the service supplier because I would not have been able to afford it. I am not working and receive a pension due to permanent incapacity. Surely, I have a right to request information pertaining to this matter and be treated with integrity and fairness. I have tried to do my own investigations with Vitalaire, the debt collector’s attorneys and my medical aid. To date I have received no answers or proof from the company or the debt collectors. My medical aid notified me in writing that they did not receive any preauthorization requests and that no claims were ever submitted by Vitalaire. I am at wits end and disgusted in the way I have been treated by all parties concerned. I do not know the way forward from here. Please note that if you want to respond, do it via email and not by telephone.