Ackermans Poor Alarm Process

Paid for my daughter’s clothes but the cashier did not remove the alarm. Came home and only realised that the alarm is still in tact on the pants. All the other times their beeper will go off to alert customers before leaving the store. This is so inconvenient and frustrating. Fuel is not cheap to make a special trip to remove this alarm and we can’t even remove it ourselves or the material will tear. Kindly advise on a solution as I have the receipt and the order has already pants.