Terrible service and experience at Miladys

On 29 Oct I visited Miladys and I wanted to buy a gift for my birthday with my mother-in-laws card. She is 84 and cannot come to the shopping mall. The ladies at the till said I can’t buy anything. My mother-in-law was on the phone and they can video call her but they said they can’t. This was unprofessional and unhelpful. How is she suppose to make use of her card if I can’t do it for her. I have done this several times in the past. If they can confirm that it is her and just do effort then all of this could have been avoided. They are unfriendly and did not even try to sort it out.