MTN POOR SERVICE

MTN billed me incorrectly and I have been trying to get this corrected but noone seems to be able to help me. They keep on giving me a variety of excuses, ranging from we are working from home, we had sent the issue to an incorrect department, we can not transfer you to a supervisor. The behavior is sickening and appalling. Its the worst ever!!!!!!!!!!!!!! How difficult is it to just fix a billing issue. I have been a loyal customer for 10 years and I am on the verge of switching service providers due to this nonsense.