For the first sentence, your second interpretation is correct. When you’re learning a language, speaking quickly and clearly isn’t easy.
For the second sentence, yes, your interpretation is correct. The “it” could refer to a document like an invoice instead of to a company; in American English we more commonly say “They have a number you can call..” when referring to a company, utility, or similar entity instead of saying “it.” Also we never say query! That’s much more British. It’s not incorrect in American, just formal and unusual.