Poor internet speeds with no response

I am currently paying Telkom for a 4 megabyte adsl line and is getting absolutely terrible internet. This I have reported to Telkom many many times. Every time a technician arrives or phones me to tell me that the network we have in Lime Acres are not big enough to cater for all the users in Lime Acres. Apparently they can do nothing to help me and it is a head-office decision to upgrade our network. They also cannot tell me whom at head-office should be phoned. Calls just stay open and nothing gets done. Meanwhile Telkom is giving those same technicians instruction to activate ADSL for more users in Lime Acres while knowing the network is overloaded and give very poor speeds and timeouts. Telkom is thus charging more and more users for 4 megabyte lines knowing that customers will not get nearly what they paid for. For a company like Telkom this is an absolute disgrace!!! Telkom, when will you be upgrading our network and service??? We get no service and are ignored for more than a year now.