They might be attempting to get you to call back, but likely they're calling more numbers than they can actually connect. It increases the odds of getting answe

They might be attempting to get you to call back, but likely they're calling more numbers than they can actually connect. It increases the odds of getting answers on particular attempt, but they can also keep track of those that answered even if their talking robot can't service every connection. Now they know they've got a live number and will try you again.