No disrespect at all intended, but this is not good advice.
First, FDCPA requires that a debt collector take steps to verify that they are speaking with the proper party before discussing the debt. If you do not verify any info with them, there's no point in even answering the phone. The goal is to solve the problem, not stick your head in the sand---whether you realize it or not, debt collectors won't simply go away if you do not verify your identity with them.
This is why I tend to tell them that I will verify the info they have on file---because without doing so, you're never going to be able to find out what debt they are calling about. Suppose they are calling about a different debt than the one the OP thinks it is? Suppose there's identity theft, and they are calling about a credit card account that the OP never took out? Midland did it to me with two separate accounts---I never took out either one. And Midland's not the only one either....others have done things like this. That's why the FDCPA's protections were made into law.
Your script fails because without them verifying that they actually spoke to the person they are looking for, they CANNOT have had verifiable initial contact with that consumer. Tell them nothing, and they won't be able to say they actually spoke to you. That would NOT trigger the 5 day disclosure of rights requirement under the law. The initial contact requirement is either directly or indirectly to that specific consumer, not to anyone in general who may or may not be the right person.
If you actually want to learn why they are calling and address it properly, you verify who you are to them when they call. Then, when they pull out the "we're calling about ____ debt, we show that you owe _____, how would you like to take care of that today?", you simply say, "thanks for calling. Before we go any further, I'll wait for the required initial dunning letter to arrive. Once I've received that, we can discuss the matter further. Thank you again and have a nice day." ----then, you HANG UP. Does not matter what they say or do. Does not matter if they try to keep talking. Does not matter. Midland made a habit of pretending that they had already sent out mail for me---they claimed that they sent it the first time on a date that was several weeks before they even got the "debt" assigned to them. When I questioned that, they claimed to have sent it multiple times to an address that had no connection to me. When I questioned that, they told me that since they were assigned the debt more than 45 days prior, it was no longer an issue, because under the law I could no longer dispute anyways. Then I reminded them that the 30 days does not start until that initial dunning notice is sent and received. Since they never actually sent it to me, they owed it to me then.
Also, don't fall into the trap of getting nasty on the phone. A lot of these collectors think they can bully or intimidate people into paying. Don't allow that. Simply stick to the statement above. I say it once. If they try to make threats or go anywhere else, I simply tell them that I have said all I'm going to say until they comply with the law's requirements, and we'll discuss further once they have done that, but not a moment sooner. Usually, once they see that they are dealing with someone who's educated on the law, they will either give up the act or get nastier, but either way it does not matter. Simply stick to that sentence and then end the call. Don't wait for them to say "good bye" or anything else. Once you say "thanks and have a nice day", it's time to hang the phone up. Simple. Direct. No room for error. And it works.
