Sitting in a yard with sewerage for six months still no help

It has been six month since I have a blocked drain in my yard. I have been calling the Joburg Water call centre and been given numerious reference numbers, whereby they will send out people from the Depot to come unblock the drain. Every time the people came they would tell me I require a private plumber to fix the drain. Thus far I have hired 6 private plumbers and the drain will be unblocked for only a day then blocked again. The problem is at the main station which is never maintained or serviced and that is why it blocks frequently. This morning I called the call centre again to escalate the problem then the lady gave me a direct contact number to call the Deport. I called and spoke to someone who promised to transfer me then the line was cut off. Then I called again then he put me through some lady called Agnus whom is suppose to be the Data Capture. She provided me with a reference number ********** 25 and referred me to call again and ask for Moss as she can not transfer. I called again and spoke to the same guy from reception or switchboard and he told me he will put me through to Moss which did not happen as the phone rang twice and it was hanged up.