Vodacom is a ****

I signed up for voda I’m fibre in March, I wasn’t told that the installation will be free and I will be paying R450 per month but at the end of the month, R1387,20 was deducted from my account. I have been calling Vodacom but I’m not getting a solid answer. They have opened a case but nothing has been resolved and it’s been almost over a month now. I am so furious because they are failing to prove me with a reason for this.