SCSS, Vanilla JS and tried my best to make this accessible

This challenge looks so innocent, but don't let it deceive you. I learnt so much!

I did my best to make it responsive: the toggle is two radio buttons, and screenreader should announce all changes made. At first I tried adding aria-live to dynamic elements but didn't quite get the result that I wanted, I tried adding aria-labels to make what was read out clearer but eventually added a hidden element to hold the full text, so that when the billing frequency is changed, all info is read out and not just the price change.

If you notice any issues, please let me know! Thanks :)