Telkom has been robbing me for 7 months now

I took a contract out with Telkom for \up to 90 mbps LTE\" in October 2015. The contractual condition was that I'm within the coverage map. according to the coverage map, I was good to go and they begun deducting R599 monthly. After the router and Antenna arrived the fastest I was able to get was 1.3mbps which is a far cry from the \"up to 90mpbs\" after begging for 3 months a technician came out late December 2015 to measure and he got the same results. I was advised to cancel the service which I have tried to do a number of times. However, the service it self was discontinued some time in Feb 2016 yet I'm still being charged every month, <br> I want my money back from October until now! I can't keep paying when Telkom is not delivering on their part. I have placed about 20 calls on various numbers but there are only empty promises from the contact centre agents. My most recent case is ***7. I want this stopped and my money back"