Builders Warehouse poor quality of goods and service

Where can one start? 1) I bough a swimming pool pump+filter from Builders Warehouse Centurion mid-Dec for R2700 2) A month later and the pressure gauge started to build moisture inside the gauge. Personally I find it stupid to uninstall the entire pump system, carry it with with water and sand to Builders for a swop-out or repair. I mailed them and the supplier being Kreepy Crauly aka Fourwater aka Poolcare to ask for a replacement gauge to swop out. The gauge is smaller than a R5 coin. Thus far I have received notifications that these two companies do not read any emails yet they have "contact us" email option. Should rather read "Do not contact us"... I even spoke to the store that is pretty much a no-show up until today. Do I go to the consumer council? What is really the option for SANs when you get such vrot quality of goods with a shrug-off as customer service?