Unacceptable and inproper billing

My account has been billed more for the past three months and I went to municipality complaining they said I must send the a picture of my meter reading of which I did and they did not fix it. Last month April I went to them to complain the man who assisted me took me to their manager and they send one of the guys who read meteres to my house and they adjusted my account. I thought this was resolved this month again I received a bill which is over charged. I'm asking myself when is this going to come to an end they billed me more units when I checked my readings is less than what they charged me. Please assist me I'm tired of this as it causes a lot of stress for me