Midas Auto Service Experts

Came here for an oil change and they said I also needed a tire rotation, I told them to go ahead and do the rotation. The car handled funny after I left and I thought they must have forgotten to balance the wheels. I went back a day or two later and told them they forgot to balance the wheels and was told that balancing didn’t come with a tire rotation and cost extra. My question is, if balancing doesn’t come with a tire rotation and a car may need balancing after a rotation, why wouldn’t they tell me that when I got the tires rotated so I could get them balanced then instead of having me make a second trip down there? The manager then asked if I wanted to get it done and I told him no, I’d go to NTB because it’s cheaper there