Bad service

I am not impressed with the service from Flight Centre. I booked a deal to Mauritius in Jan (my flights were booked separately). I was not advised or offered travel insurance yet the deal I bought came with a Captain's Pack that offers an upgrade to Comprehensive cover. Weeks later a friend asks if I have insurance and I tell him I hadn't thought about it. I then go back to Flight Centre to find out if I can get it via them. I get ghosted. Eventually I go back to my flight supplier and it turns out I have complementary cover with them. Great. On reading my Flight Centre deal I realise that I can get an upgrade if I have standard cover - great, I go back and I ask to be quoted to be able to qualify for this upgrade. Anyway after being sent from pillar to post I now get told it cannot be upgraded, I should have taken the insurance with Flight Centre when I booked to be able to qualify for this upgrade. This was never mentioned to me. I have now had to pay at least R500 extra for my own Comprehensive Cover when I could have saved it because my deal allows for this upgrade. Customer service sides with the agent and covers up for her making it look like I did not communicate properly. No one is wanting to acknowledge that we wouldn't be here had this been done properly from the beginning. I am afraid I will not be using your services going forward, train your agents properly not just to secure a sale and move on.