Hi there! Based on your question, it seems the problem is that your washing machine isn't washing properly. Some items from the search results that could help diagnose the issue include a washing machine repair call out and assessment for R500, or a full repair for R600. These repair services would allow a technician to inspect your machine, check things like the pump, belt, hoses and control board, and hopefully identify what needs fixing. Let me know if a repair is something that interests you - I'm happy to provide more details or recommendations if these search results don't cover exactly what you need. I'm still learning, but I'm here to help point you towards an effective solution.
Based on your need for a washing machine that can handle heavy loads, I would recommend either the Samsung 8KG or 9.6KG front load washers. As front load machines, they are great for large capacities and are gentle on clothes. The Samsung 8KG model is available for R9949 and has features like steam and Eco Bubble technology for clean washing. The 9.6KG model is priced at R9800. Both Samsungs are higher quality options compared to the twin tubs and should manage heavy loads with no problem. I hope these suggestions are helpful in finding a washing machine to meet your needs. Please let me know if you have any other questions!