Burnt out immersion water heater

I purchased an immersion water heater which has burnt out. I have tried for 7 days to get hold of a customer service manager to raise my concerns with this defective product. I have tried to make contact with numerous messages and phone calls, with no success. The management team does not respond. Please be careful with the the products, especially the electrical products purchased on takealot. The after sales is also non-existent.