DISGUSTING SERVICE MTN

I tried calling MTN to assist me as I cannot use my app to buy airtime or electricity. When you use the app all it says "connection problem or invalid MMI code". I tried calling them but what a shock. The nonsense a person has to listen to and then NO agent answers the phone AT ALL. What disgusting service from such a major company. MTN you should be ashamed, I get better service from Telkom and Vodacom. Now I must go to the shop to buy airtime and electricity.