Useless and *****ed overcharging customer on direct debits and refuse to cancel service

I wish there was a no star option....This is the most useless company there is. Every few months a problem and to resolve the simplest things takes months or never (i ended up cancelling as i got so fed up) So to start with i had a 20mbps line which was ZAR 754/month (inclusive VAT) Suddenly my debit order says that ZAR 899 have been deducted and when i queried it, I find that Vodacom has "mass-migrated" me to a 100Mbps line without my authorization or even notification. Their reasoning is that they have discontinued the 20mbps service and that gives them the right to just put me on another higher plan at a higher price without telling me... NO! Other months they just debit whatever they please regardless of what your contract says. Then, I come and want to cancel and they literally trying to send me around the bend trying to prevent me from cancelling, saying unless i can give them all the technical details of my line they cant cancel me. Then I go and check the technical details they say someone was already busy with my cancellation and I need to go back to that person but that person is busy and i would need to wait for a call back which obviously never happens..., There is more, but I am exhausted even to talk about this useless company. Just glad that after 5 phone calls today I got a cancellation confirmation. Finally. Stay away from that useless service.