I switched Insurance's as of December 13, 2017 and...

I switched Insurance's as of December 13, 2017 and my common ground plan was made inactive, yet there was a $550+ payment taken from my account on December 26th, stating that it was for coverage for Jan, 2018.
When I called common ground I was told that it was taken out because the payment processer for the automatic payments wasn't done through them, it was a third party and I'd have to turn off my automatic payments online and then wait up to a month to receive my money back. So, the insuance company took my money out for insurance that I do not want and do not have, and blamed me because I had set up automatic payments as to never be late with a payment to them. Now I can't pay my rent for January and they said there is nothing they can do about it.