I doubt you can force them to provide the service with the original terms, but you might be able to ask for a (partial) refund. If not today, after a week of verbal abuse they will receive for this online.
It depends where you’re located. In the EU they have to honor the contract you entered, but presumably there is a clause that they can prematurely terminate the contract without cause and give you all of your money back (from the start of the contract).