Account was hacked and plan was changed. Deezed doesn't help me?!

My account was hacked but I was able.to change my password. They have changed my plan to a year plan (Deezer Duo) which I don't want. Contacted Customer Care and they can't do anything about it?? Because they can't "downgrade" a plan. I haven't chose this and I'm contacting within 24 hrs. I'm stuck with a 1 year plan now with a large one time payment. How can we fix this??