Billed incorrectly

I had a new Control Panel installed, as well as beams across my driveway. I had paid a substantial deposit, but had informed them that i would withhold payment until the technical issues were resolved. Nothwithstanding, when I received my January Telkom account, I noticed a total of R140 calls that were billed to a special number. Further investigation revealed that everytime I activated/deactivated my alarm this would dial to ADT. Technical department then came out and supposedly corrected the issue. After complaining, it was agreed that I could pay the balance less R140 and that we would be all square which I did. I then received my February Telkom account and this time it was R155 worth of calls. Obviously I raised the issue immediately (17 February), was asked to send them proof of both Telkom accounts, which I did, and now despite MANY calls to their 0860 number, hanging on for different lengths of time, and being pushed from pillar to post , I still do not have any answers. I would like to be reimbursed for R155 as well. Look forward to a response, please