Discovery health unflexible

I have been a Discovery Health member for well over 10 years, on the comprehensive plan. The beginning of 2019 I moved down to the coast and downsized my life. I therefore downgraded to the coastal saver mid year. I then downgraded again to the coastal in December to a Hospital plan, as I thought I could not afford the Coastal Saver any longer. However, they still debited me for the Coastal Saver plan and I realized I could afford it. I called in and asked if they would please consider taking me back to the Saver instead of the Hospital plan only, considering it is still the beginning of the year. i.e the 10th January. However, even the manager told me that there were no exceptions and they could not put me back to the saver plan. I think that they should take my case into account, considering it is still early in the year and taking my history into account. Please could someone re-consider this decision? Kind regards Bev Baxter