Can't connect with 2 businesses

mum2afew

So I have 2 different businesses that I call for make appointments etc and it's very strange, it will ring, and if it goes to their machine/answering service it'll let me leave a message. But if they answer it, the line goes dead, neither of us can hear each other, the call is dropped. It's very strange. My husband also had this problem with the same businesses.

Does anyone have any ideas? I opened a ticket, I just thought maybe someone here had an idea.

Thanks