GREAT CARS BUT HORRIFIC SERVICE

I have a Range Rover sport that went out of maintenance at the end of February. First week of March my entire suspension completely broke. Land Rover SA & Land Rover Midrand found every excuse in the books to ensure that I pay for it. They even cancelled the 2yrs Extended Maintenance that I had taken when I bought the car less than 2 years go.. they did not even have the decency to remind me that I had paid for this option when I bought the car. The reason they cancelled it is because they said that my car missed a service in September last year, & yet when I took my car in to them for a day in December no one thought to tell me that the car was due for service. they replaced the parts that they needed to replace for a full day & it didn't bother them that my car had missed a service. I am a single woman that does not know much about cars, Range Rovers (unlike BMW's) don't alert you when the car is due for service. Why would they keep my car for a full day in December & still fail to tell me that my car was due for service, did they not assess the car?The WORST SERVICE EVER. I paid for extra 2 years maintenance for nothing, they had the guts to cancel it without even advising me..