Vodacom Increasing Monthly Debit Order without my authorisation

I have been calling customer care and it doesn’t go through. My monthly debit order has significantly increased without my authorisation. Vodacom does not respond to emails. This is my second hellopeter. Best way to deal with this company is through the Ombudsman don’t waste your time. Should you get an calls from Vodacom sales just drop the call, otherwise you will find yourself paying double the amount you initially contractually agreed on.