get on to (someone)

To make contact with someone, especially on the telephone, for a particular purpose. Primarily heard in UK, Ireland. You'll need to get on to their customer support team to get that issue resolved. I'll get on to the airline in the morning and find out when the next flight is leaving. Can you get on to the towing company and see how close they are?

get onto

1. To step aboard a mode of transportation (such as a train or airplane). I think you'll feel better once we've gotten onto the plane and are headed for Hawaii. As soon as I got onto the train, the conductor announced a delay. We're in the last boarding group, so we can't get onto the plane yet.

2. To make contact with (someone), especially on the telephone, for a particular purpose. Primarily heard in UK, Ireland. You'll need to get onto their customer support team to get that issue resolved. I'll get onto the airline in the morning and find out when the next flight is leaving. Can you get onto the towing company and see how close they are?

3. To figure out that someone is doing something in secret. Keep your voice down, we don't want Mom to get onto us! The police are here—somebody's gotten onto us! We need to leave town ASAP if the cops have gotten onto us.