Bad Service

On the 2nd of December we app**** for a upgrade of our 4mb adsl line to a 10mb line which was said to take 7-10 days. Up until now we have not been upgtade to the 10mb line we have phoned the call centre and visited the local offices numerous times and keep getting the same response the application is stuck in the system. There is nowhere that we can go to complain about this poor service and Telkoms consultants even said there is nothing that they can do about this. So what to do now???