Bad after sales support

We have a Univa U116B stove aged ± 2 years. From the start I have not been very impressed as the oven walls are very flimsy and on very first use the grill just fell through when we placed a dish on it. Then we started noticing that old favourites takes almost double the time in the oven than usual. Now the oven door does not want to open all the way causing me to burn myself every time I have to put in or remove a dish from the oven. Changing the height of a grill rack is not possible anymore. I contacted '***' with no response. I contacted Lategan & Van Biljoens as the stove was bought from them, but even though sales forwarded my query to the relevant department, I have also had no response from them. Although the warranty period has expired, I still feel with ovens one would expect a better life expectancy - it certainly has been my experience with Defy. It seems once the sale is done Univa and Lategan & Van Biljoens doesn't care to enough to give support to their customers.