ECSA completely unprofessional

ECSA keep on sending me incorrect statements not reflecting the payments I have made. All my e-mails to finance@ecsa.co.za or engineer@ecsa.co.za go unanswered. My ECSA login also do not work. They do not answer their phones, call centre is always congested, so how do you actually communicate with this supposedly professional organisation? My registration number is 20000049