Stressful pregnancy due to them not meeting their own terms

I am currently 20 weeks pregnant.... Momentum advised that l would get 4 gynae appointments and my tests will be covered... It turns out they paid for some of my appointments and they are not paying the last appointment for some odd reason. I have now also received a statement from lancet for the tests that are supposedly covered in my benefit.... I don't understand why they write all tbese things and fail to keep their side of the agreement. I just need them to pay for what they are supposed to, l don't understand what is so difficult. Now, the thought of them disappointing me when it's time for delivery is giving me sleepless nights. I don't understand the pleasure in distressing pregnant women and l see I'm not the only one who is pregnant and stressed.