Dish cant do anything about it remotely especially with a 722, there only option is waiting for you to call (or not breaking it in the first place would be a lot better).
To resolve it yourself, if you truly have a 1000.4 with the 77 LNB:
Menu(Top left on the remote) > 6 > 1 > 1, on the right you will have an option called Check Switch, highlight it and select it. Take note of the satellites listed (you should see 77/72.7/61.5 in that order) then on the bottom select the Test button. Once finished you will be back on the previous screen, you should see satellites X/72.7/61.5, meaning that the receiver has forgotten 77 and you should be good to go.