COCT are pathetic

After signing an affidavit saying I do not want a new water meter, the City of CT promptly installed one without informing me and are now expecting me to pay for it. R5000. I have been to their Milnerton offices numerous times, emailed them over and over but they don't seem to understand how an affidavit works. They keep asking me for proof of the affidavit and when I mail it them and explain it is lying at their office, they somehow do not understand. I keep getting mails and sms's saying I better pay??