Rudeness over the phone

I recently purchased the JDC1104 dress in a size 6 but found that the side zip would not go all the way up due to my bust size, I phoned the Rosebank store to find out if they had a size 8 in stock so I could exchange. Upon phoning I explained the situation to the attendant (Thapelo or alike), she responded by telling me that I sounded more like a size 12 over the phone. This comment was highly rude and inappropriate and is completely unacceptable. Staff in Forever New stores are often rude and aloof but this instance is really disappointing for a loyal customer. The clothes in the stores are amazing but the staff is always such a let down.