H&R Block

I used the services of this location to get my taxes done last year because it was a little more difficult than typical years for me due to some complicated forms… Then I received a letter 6 months later from the state tax commission about an error and money that I owed. Originally I was told that I would get a return. So now with the error, I owe a significant amount of money which I would have liked to pay out of my original federal return, but now it is too late.
The original accountant to help me only works there seasonally, so I was helped by Crystal who was super nice and helpful!
However, H&$ Block will only return my service fee. In my opinion they should pay the amount of which I was not made aware due to the error + the service fee. And it has now been almost a month since I was told I would receive the refund in the mail. And when I called to check on it, they were of no help at all.
I am very frustrated because I have been put in a difficult financial position thanks to a simple error that was made on their end. I will likely not use H&R Block in the future.