suggest that you find a good audiologist and see if your insurance covers hearing aids. You will need them after using that fog horn, since it is a very well known fact that the telephone system will not transmit that sound at a decibel level that will do anything to the person on the other end. You however will be a different story since you will be in an enclosed space with that sound at a decibel level that will damage your hearing.
It just happened to us about 10 minutes ago. Same damn thing!!! If they ever call you, try your best to piss them off just as a little bit of payback!!!
When I asked which grandson, he said oldest. I asked his name. He gave a name. Nope! Not my grandson. I received one of those calls a few months ago that almost tricked me into giving the caller thousands of dollars. I avoided the scam that time by calling my grandson on his cell phone. Nope, not the person who called me. This time I knew better sooner. I hung up on him.