UPGRADED MY SERVICE WITHOUT MY CONCENT

My service got suspended all out of the blue due to arrear amount which I didn't even know about !!!!! Vodacom sommer upgrade my fibre without my consent with a high amount and continue with that higher amount and bill without letting me know or even get my permission. Now my line got cut with a due to non payment but my account is a debit order and clearly they did not contact me or even try to let me know what they not debiting anything FOR MONTHS from my account. Who gave them the permission to upgrade my account without me knowing. They just one pathetic network who clearly does not care about their customers.