Our expert says:
You need to make a formal application to City of Cape Town Law Enforcement to have this investigated (the number I was given: 021 596 1999). I'm pretty sure what you describe is not legal. A house of worship like a church needs specific permit to be established, and even then, can only make noise at specific times, not constantly. You might need to be persistent to get follow-through and make sure this does actually get dealt with. I would recommend getting as many of your neighbours involved as possible: perhaps draw up a statement and get everyone to sign it.
It might also be worth contacting CCT's Environmental Health dept.
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