Empty promises

This is the second time I am writing on this platform regarding the empty promises from the Medical Aid. In April I purchased a machine that was needed, I got an authorization number from the medical aid stating that it was approved. I would not have purchased the item without an authorization number. I have contacted the customer service every week to find out when I will be reimbursed and every time it's the same story, it is being sent through urgently and I must contact them in 5 days, when I phone back after 5 days it still has not been settled. I complained on here last week and response I got back is that they are looking into the query, well it's been 7 days and still nothing. I am fed up with this, every time it's the same story, but no one can for sure tell me what is going on.