Vodacom Fiber - incorrect Bill

So after waiting a month for fiber to be installed, we now have a very big problem with our bill! If I knew this was going to be the issues I would have never done this through Vodacom. I have called to find out what the issue is and was told I have been back dated from May 2020. We got the router end of May, only got the actual fiber installed end of June. Now we need to pay since May, after being told we get a month Free! What in the world is wrong with this service provider.

Please get in touch with me, and don't tell me that my bill is correct because it is not. I need to speak to someone who actually knows what the hell is going on. I cant be charged for something I did not have and then get a month free and still have to pay for the free month!