Vodacom are really ****mers

I had a problem with them when they lock my home wifi router in April and wanted me to pay month end of April for something i never used. (Dear Vodacom Customer. Your service ticket with reference number EC-1TOE-1D50EN has been closed. Thank you Vodacom.) The message i put in brackets was their response after numerals complain. I recently received the message from Vodacom saying i owe them over R800 for the in-Active home wifi router and i can't even call them as they blocked me because i complain too much.