Why am I being charged .99 per month again?

As you are being charged the same amount every month, it looks like it could be a subscription you have signed up for. Remember "free trials" do continue unless you cancel them directly.

You can view and cancel your subscription following the steps at How to cancel a subscription from Apple – Apple Support

If it is not a subscription check out > If you see "apple.com/bill" on your billing statement – Apple Support

You could potentially try and claim a refund by contacting Apple's Form > Request a refund for apps or content that you bought from Apple – Apple Support however this isn't guaranteed and it is up to whether Apple allow the refund or not.