Poor customer service N1 city

I regularly support the N1 city store when purchasing beans or teas. I was gifted with a bag of coffee beans and my grinder had broken so i made the trip to the store confident that they would (at a fee) grind my beans as it was in a sealed bag and could not in any way contaminate their grinder. I was told no! No reason or excuse, just No - asked to speak to the manager and her behaviour was very unprofessional. She didn't even bother to give me an explanation but turned away after the sales lady explained to her that I wanted to escalate it. I was then asked if i would buy a grinder ?? Well that is the very last time i will support this store and. Its really sad that this service could not be offered but even worse is the poor customer service from the person in charge. I understand if they are not allowed to do it but at least show some damn empathy.