Unable to rectify line speed problem!!

I was staying in a house that has a Telkom ADSL line that was running at 4 Mbps, but the account was not on my name, so we arranged for the account to be transferred to my name. from there on the line speed is now half the speed it is so pose to be. now running 2 Mbps. After several calls to Telkom and almost a month later i still have the same problem. They sent a technician to my house without an appointment to come and see to the problem, but i was not home. I phoned again and asked for the technician to come back, late that afternoon the technician calls me and gives a simple explanation to why the line speed is not what it is suppose to be, an explanation that makes no sense.<br> The next day i was notified via SMS that my fault was closed and resolved. my REF nr: (1038CTK180116)