Telkoms shady billing

I entered into a contrac with Telkom for wifi in August 2017, I was told as well as shown on a map that my area was covered for LTE, all to find that once I had set up the router & sim none of it was working.Needless to say I followed procedure & called their call centre & even went to a number of Telkom outlets that gave me no joy. In Jan 2018, I finally managed to get my contract cancelled & fees waved as I never used the service. Then in Feb 2018 I was debited R1000 & to this day no one can explain why I was billed after my contract was cancelled. I spoke to the store manager at Sandton a Mr Philip Leage who was/has been of no help in resolving my problem, they guy basically makes empty promises & doesn't follow through on what was discussed.