Finally after two years of trying to get this issue sorted we've managed to get in touch with our local councillor who put us in touch with the right person at the municipality and they are coming to inspect our sewerage pipe on Friday morning.
During the flooding late last year and the usual heavy rains of 2012 & '13 we had the delight of sewage bubbling up in our bathroom. I was able to release the screws from the inspection cover very quickly which stopped the flow into the bathroom, directing it into the garden instead, leading to the discovery of all manner of unpleasant items in the garden.
This combined with the flash flood in November made for a very nervous few hours as we waited for the water to recede.
Please pray that the municipality will acknowledge the problem and resolve it ASAP, I really don't fancy another winter of having to pick up other peoples nappies and sanitary products.