ill-advised on motor plan extension

It is so sad how true the saying "one rotten potato can spoil the whole bag", this is the experience we( me and my fiancee) are currently having with Audi Revonia.Our relationship started very well because of the excellent service we have had thus far from the technician(Flyod).On the 3rd Jan 2020, we booked the car in for a service(the car did notify us that it is due for oil inspection) and the mileage was on 102000km and we were told the car is not on any motor plan and we have to pay car and this was the beginning of our nightmare with them. In August 2019 we paid 15k to extend our motor plan and the lady Wilna De Lange was helping us with that and the car was also due for service then. We advised her that we are people that travel a lot (our work and lifestyle requires traveling), based on that and our history of services we had with them and her "calculations", we trusted that the product that we will be paying for will be one that will work for us but instead we were ill-advised and were sold a product that worked against us, the product that she sold us was an extension of until 24 July 2020 or 100000km and mind you we have already taken the car in for service of 90000km in August 2019 and that would have caused us around 4K cash but it made financial sense to us to pay 15K for another year including maintenance. We trusted her advice and also the fact that the previous plan based on the period and not only the period. After few calls with Audi SA which they advised us that the dealer must extend the mileage of the extension of which Audi Revonia refused(we were dealing with the manager at this stage) unless we pay 12K or the last option they can help us with is to trade in the car. My biggest issue is that no one (not even Wilna)has taken accountability or apologized for the fact that we were il-advised and that to me says that they do not care. Secondly, it means we paid 15K for a minor service which to me does not make financial sense for someone who awakes. Thirdly, the ignorance of them to even suggest trading in without even thinking of dealing with the elephant in the room is beyond me. we have until 105000km to make a decision as to whether we pay 12k or trade-in, we have tried to reach out to Audi SA after the dealer refused to extend the mileage by they also have been too slow and this is twisting us in the direction of trading in because we are scared of missing any service as that will have major impact on the service book. The stress that these people are putting on us is too much(I'm 6 months pregnant and stress is something that I do not need especially that is resulted by *********** people) and now they are forcing us to add a long financial pardon by trading in, it hasn't even been a year since we have had the car and we were not thinking of that option. We are planning to escalate this further and on every channel, if they continue not taking us seriously and owning up to their part.