First, be persistent. Accountants and their secretaries are people. They don't necessarily have the best handle on all of their communication streams.
Second, there are these things call "telephone books" that list the "telephone numbers" of businesses in a section called the "yellow pages". Sorry, snark aside, it's pretty easy to find info about the accountants in your area (and I would prioritize finding one that is close, so you can easily visit their offices to drop off last-minute paperwork). Pick a few in your are and go visit their offices. Talk to them. See if your bullshit detector goes off.
Second, there are these things call "telephone books" that list the "telephone numbers" of businesses in a section called the "yellow pages". Sorry, snark aside, it's pretty easy to find info about the accountants in your area (and I would prioritize finding one that is close, so you can easily visit their offices to drop off last-minute paperwork). Pick a few in your are and go visit their offices. Talk to them. See if your bullshit detector goes off.