Vodacom Incorrect Billing and account issues.

I have been with Vodacom Fibre for roughly 4 years now and never had a problem, until I needed to downgrade my line with them to a 60/30 FF, this was done in February and has still not been resolved? Instead my line was upgraded to a 240/120 FF at a cost of R1049.00 pm, Instead of paying the R699.00 I needed it downgraded to. Despite my numerous calls to Vodacom, and numerous consultants I have spoken to, not 1 person appears to be able to fix what I feel is a simple account issue! I have now opted to cancel the service now, only to be told I will now have to pay for the equipment I was provided with for the above upgrade, I did not request, nor was I sent any new equipment! I strongly advise against Vodacom as an ISP if you wish to actually keep your account up to date.