Poor poor customer service

I’ve been a client of this business for a while, ordering smaller quantities. My business has recently grew significantly and I wanted to discuss some product specifications with a person. They absolutely refused and insisted that I put my enquiry in writing. After going back and forth a lady finally rang me. Only for me to find out it was the receptionist. I told her that I have a technical product related question and that I need to talk to someone who can answer my questions. She took offence and still i received no call.