After three weeks still no joy from Bosch Siemens

About four years ago, I bought a Bosch dishwasher. Based on reviews, I considered this a good buy. On 5 November, the machine would not switch on. After checking the power cable to ensure that there was no problem there, I reported this to Bosch Service on 6 November, and they gave me a reference number. I was informed that I would have to pay a call-out fee of R750 for the technician to service the machine at my home. I then heard nothing from them. On 10 November, I contacted Bosch again and shortly after, one Fernando Fraser from Kitchentech in Mbombela contacted me and said that he is the technician appointed by Bosch to assist me. But then he said that I would be responsible for paying his travelling costs to Piet Retief, where I reside, which would total around 550 km both ways. He did, however, offer to assist me telephonically, and after following his directions, we could determine that the PC board had blown. At a cost of R2974, he couriered a new board to me. However, after fitting the board, the machine still did not switch on, and it then became clear that some of the other electronic systems were causing the problem. I made my sums: R750 (callout fee) + R3000 (PC board) + 550 km x R4.76/km = R2618 + the cost of any other blown parts would eventually be much more than buying a new dishwasher from Takealot and having it delivered to my home. However, I felt that I needed to be refunded for the PC board, which I had paid for. Bosch apparently has a policy that parts cannot be returned. Fernando Fraser, the Bosch appointed technician, also refuses to refund me. Bosch has offered to give me an upgrade option to receive a new Dishwasher at a reduced price, except that the reduced price they offered is higher than buying the same model from Takealot. My contact at Bosch, with whom I discussed this, was Simphiwe Mabelane. She was the only person willing to discuss the problem with me, but since yesterday (25 November), she has refused to take any calls from me, insisting that I email the management team, as she cannot resolve my problem. I have emailed the management at Bosch on various occasions, but received no response from Mpho Mabogwane, Aziza Hendricks, Atish Beecum or Sontaga Mahibila. There is absolutely no interest from the service team to resolve the issue, which at this stage is that I want a refund on the PC board, which I bought and which did not resolve the problem with my dishwasher. I am in the process of buying a new dishwasher from Takealot. I need someone to contact me so that the money I spent on the PC board can be refunded to me.