Did not pay for my delivery

I joined Momentum Health in August 2020 (after canceling my previous membership with them due to COVID) and all was well. I was then later diagnosed pregnant for the first time in late October 2020. Momentum congratulated me and paid for all my scans, test, etc. At 38 weeks pregnant they called me notifying me that they will not be covering my delivery! This is after I went through the pre-auth process at the hospital and did everything by their book. Their excuse was that on my application (Aug 2020) I **** about being pregnant when I was first diagnosed as pregnant in October 2020. I explained that I have irregular periods to them and even got my GP to confirm it. Their further response was still not covering my delivery and adding a waiting period on IRREGULAR PERIODS! Added my newborn baby onto my plan and he got a 6 week waiting period, which is ********! Furthermore, they do not communicate with members on anything other than income verification. Very very disappointed.