This two-part sentence tells us a lot about bureaucracy and the challenge of being in the middle. I heard it twice in one week from hard-working but underpowered people in organizations that should know better.
The first half, "I'm sure," is a statement of power. The speaker is trying to establish trust and authority with the customer by owning what is about to be said, speaking for the organization.
And the second half, "probably" is the waffle, the denial of the responsibility just claimed. Don't blame me!
Obviously, the symbolic logic here doesn't hold up. It's nonsensical to say sure and probably in the sentence. But it's a symptom of the impossible situation so many large companies put their front line in.
Either let them own it (not just the saying, but the doing) or teach them and empower them to hand the interaction to someone who does. You build customer loyalty and connection not by answering fast, but by engaging with respect and transparency.