Vodacom fibre

I am not happy with vodacom. I have a fibre contract with them. In December they deducted almost R3000 from my account instead of R750. I was away so i only contacted them when i came back on the 10th of January. Up till now i am the only one who has to call them at my expense to find out why but they keep telling me they are investigating and someone will call me. Why are they not explaining the reason for duducting that money? I never skipped a payment. On top of that they send me the bill for January only to find my subscription has gone up and when i asked they said they did a group migration because the speed i was on was no longer available in my area. So i told them i would like to cancel because i can not afford it only to be told that they will ask someone from the migration department to call me maybe they can downgrade me. How? When they have just told me the speed is no longer available. Fine, they called me and send me an online quote for the downgrade which i approved. Only for them to deduct money for the upgrade today. I honestly am so disappointed. First of all i never approved the upgrade and secondly why charge me for the upgrade when i have asked them not to and approved it. No one calls me, they dont reply emails. Seriously robbing the poor in broad daylight. I am seriously lookingfor another service provider because i am being ****** here. Please Vodacom i want my money back.