When you say "no one" do you mean "no plumber" or no friend/neighbor/family member?
follow the electricity....most wouldn't dig two trenches. it probably goes out to the well about "just" above the water inlet. you may not have a shut-off with a well - the breaker takes care of it!
disturbing the dirt and leaving it uncovered will add to the problem.
take a picture of what you dug up, should be interesting - you probably have a clogged galvanized pipe rather than a frozen one....well, it is frozen now that it is exposed. I don't even want to think about the health of the pump - when was the last time it was replaced?
if you need a pump, you should get the pipe to the house converted (probably PB ?), set to the right depth per local code, a shut-off (maybe), and a backflow preventer.
oh, I noticed some of the real plumbers on this site are from the northeast - which would make your home "new".........it would need to be in the 1840s to start qualifying as really old