Car financing

I purchased a vehicle at Audi/United cars east rand mall on the 12th of June 2018, I requested them to remove all the added products (well, they removed the and left 2 of them without my consent). Recently I requested my payment history statement only to find out that I'm being charged R414 for vehicle tracker and R75 for tyre warranty, I called them to cancel them and I was told it's too late to cancel & they no longer answer my calls everytime I call. How do I solve this problem? Somebody help