Poor service and lack of transparency

I have been a cancer patient on the Oncology benefit since 2016 and, until recently, I had never experienced poor service from Discovery. Unfortunately, the level of service has declined significantly, and there appears to be a lack of transparent communication. I underwent a CT scan on 15 January, which I understood would be covered in full under my Oncology benefit. Today, when I visited the pharmacy, I was informed that I needed to pay cash because my Medical Savings Account (MSA) had been depleted. This came as a complete surprise, as I am certain that I have not exhausted my savings. After contacting Discovery for clarification, I was informed that a co-payment had been deducted for the CT scan on 15 January. I was never made aware of this co-payment. I would like a clear explanation as to why the scan was not fully covered under my Oncology benefit, as expected. I also urgently request that the deducted funds be refunded, as I rely on these savings for my essential medical needs. I must express my deep frustration regarding this matter and would appreciate your prompt assistance and transparent feedback.