Telkom
Can't seem to cancel - Am still being billed

Hi there,
My company, HeyPapaLegend, was moving out of our premises in Green Point. I phoned Telkom to enquire how I go about cancelling my lines. I emailed the cancellation letter through to Telkom and cancellation letter to Webafrica who was my ISP and had my ADSL line. (This was on 31st Jan)
The following day I went into Sea Point Telkom branch to make sure that my request had been processed.
Several weeks later I phoned Telkom again just to MAKE SURE one last time that everything had been cancelled. I was told that there were no lines being billed from that address.
Great stuff right?
Recently, after realising my bill was too high, I went into the branch and they told me I was still being billed for one of the lines at my old address. I asked if we could cancel it in the branch and credit my account. I was then told that it was impossible in the branch and that I had to email them.
So I emailed them my cancellation letter.again.
Now am told that the reason for the no cancellation was my ADSL line was still with WA at the time and I had to resubmit my cancellation.but haven't i done enough? how many people must I phone? How many branch visits? They must sort it out and credit me.