Santam not honoring their promise

We had a claim because our solar geyser burst. We had an Apollo geyser before, with a sensor to monitor the temperature of the water during winter because it does not produce that much hot water during the winter months. Santam called me and asked if they can swop it with a Kwikot geyser also solar, and I was assured that we would be in the same position after the install than before. I still mentioned that we had a sensor, and that we need that for colder days. After installation, the contractor placed the old sensor just pasted on the hot water copper pipe and told me its working fine. We get readings of 80degrees now in the middle of the night. When we called Santam to send someone to come fix the issue we were told that this case is closed, and very rudely told us that we have to pay for the sensor from Kwikot. But how are we in the same position when we can't measure the water temperature? If I knew Kwikot does not have a sensor, i would NEVER have told Satnam to put a Kwikot geyser when I had that available with an Apollo geyser.