Disgusting service

The most shocking and disturbing service received from a consultant in the billing department a few mins ago. I have changed my address at the beginning of the year and I am still receiving statements in the old address. This is after I confirmed the next statement would be correct. I have asked to speak to a manager and the consultant had the audacity of refusing to assist. All I kept getting from her is that she will save my details and get someone to call me in a few days. When I insisted on speaking to her supervisor she said no. Then said the supervisor isn’t working today. I am so sick and tired of struggling with bad service in this country. And that after being with MTN for over 20 years. Shocking and unacceptable