Downgraded benefits

We are on the Coastal Saver plan where I used to get a yearly mammogram. This has now been made only every second year. I submitted a letter and motivation from my doctor as to why I should have one in January (15 months since last one) but Discovery say I have to wait the full 24 months. I think this is one of the worst decisions Discovery have made - giving us less benefits and we pay more every year. Plus we have to wait a full 24 months - cannot even be in a calender year. Very sad support from what used to be a good medical aid.