Landrover Menlyn worst after sales service

I bought a Landrover from Menlyn from Okie 2021. He was all nice in the beginning promising to get us the landrover experience as you get this when you buy a landrover. To this day we have yet to get the voucher for the experience! I then tried to sell my landrover back to Menlyn. Only to get R650 000 for my 2 and half year old car!!!!! We buy cars bought my car for R890 000. How is this possible? Landrover menlyn service to date is the worst garage and customer service I have ever had. I have had other brand cars. Needless to say landrover has lost a client for life.