I need to second this, you've done a great job of keeping a level head and focussing on getting the issue sorted. Now it is sorted and they've admitted fault it's time to follow up and ask for your money back.

I hate when people do this but totally thirding this. If you don't get the money back from them, something is seriously wrong here.

You have admission of fault. Right there.

Just a guess, I'm betting their terms of service are written so it's almost impossible for them to be in breach of them.

Not to say they won't give a refund, but I'm guessing their lawyers have things setup so they aren't obligated to.