Give the prospect a reason to answer.

“Are you happy with your current agency?” That’s a surprisingly demanding question to ask someone who didn’t expect your call. To answer properly, they may need to explain their targets, the relationship, what’s working, what isn’t, and why they haven’t changed anything. You haven’t given them much reason to do that work yet. Compare it with an opening like this: “Your ad offers a same-day response, but the enquiry form asks people to allow three working days. Is that intentional?” Use that only if you’ve actually checked and found the mismatch. It gives the buyer a small, specific question they can answer. There may be a perfectly reasonable explanation. There may be something worth investigating. Either way, you’ve brought something to the conversation. I’d be careful about turning this into a hunt for mistakes. Nobody enjoys a stranger arriving with a list of everything they’re doing badly. Look for something relevant to the result they’re trying to achieve. Describe it plainly. Leave room for context you don’t have. Then see whether they want to talk. A prospect who can recognise the relevance of your first question has a much better reason to answer the second.