Telkom Fibre

I made an enquiry online for the Fibre Home Unlimited Premium 100mbs download and 50mbps upload. An agent called me back and indicated that I will be charged R1120 for the package, not R1199 as advertised which would include anytime telkom to telkom calls. Ever since I signed up Telkom has been charging me R1359,77. I have called their billing department every month and all they do is send an email to the sales department and their so-called "back office" but no-one can correct the error on their side, and no-one is allowed to contact their "back-office". The Telkom agent in the sales department also just cuts the call when you explain the situation. Each department passes blame to the other department.