Happened to me once with a removalists company. All I did was call to get a quote and was very clear about just wanting a quote, not a booking. Did call them back to enquire about locking it in, they never answered their messages for over a week.
I booked another company and then got some very abusive phone calls after they realised I'd made other arrangements. Laughed down the phone, he told me he knew where I lived. I told him I knew where he worked, that we'd moved the date forward and had moved anyway. Then laughed down the phone whenever he called.