ADSL line upgrade

I called the call centre last week Tuesday to have my ADSL line upgraded from 4mbps to 10mbps. The application was done and the call center agent told me that the line would be upgraded within 48 hours. On saturday it was still not done, I called the call center and the agent told me that the technician is at the exchange and the upgrade is being done as we speak. Yesterday it was still not done so I called the call center again and the agent told me that it would be done yesterday. This morning, you guessed it. STILL NOT DONE! So I called again only to be told by the supervisor that my line only supports up to 2mbps but I have been running on 4mbps successfully for the past 3 years! I gave the supervisor my cell number as she said she would investigate the matter and get back to me. This was at 8am and needless to say, I am STILL waiting for her call! Reported this on facebook as well. Still waiting for feedback!