First guess is Pictus based on the long barbels, second guess would be some sort of synodontis. Im leaning way more towards pictus though, Pictus Pimelodus.
petstores are notorious for mislabeling fish. as the educated fish keepers we are, it's more our own responsibility to know and research what we are buying beforehand, because most of us take petstore IDs/advice with a grain of salt.