Not given correct information from the start

I app**** for a Telkom line at my home in Bedfordview. I was told by the Eastgate branch that the maximum line available to me for that area was 10 megs. I accepted this. The line was installed on the 5th of January 2016. I bought a data package through an ISP and connected everything. I could not get faster than half a meg download. I have queried with Telkom and have been told by their technical department that although i have been charged for a 10 meg line, the fastest I will get is 4 megs. Upon querying this with Telkom, they told me they would need to check. I have spoken to two different supervisors and to date, have not heard back from any of them. Telkom either needs to investigate and resolve or take their line out as I was not given the correct information from the start.<br>