Failure to deliver Oxygen cylinder to a patient

My Mother is suppose to receive an oxygen cylinder that was approved on 26 February 2020. To date the cylinder has not been delivered. Phone calls were made to the Port Elizabeth branch on various occasions but to no avail. They are very unhelpful. Phone calls were made to a lady in Head Office as well but again to no avail. Last year we also experienced problems with Vital Aire, seemingly they either do not understand the urgency that people feel when they do not have oxygen available or else they just blatantly do not care.