Poor customer service and unfairly treated

Good day

I purchased a 2015 Golf R from CMH Nissan Hillcrest May 2020. At the time of purchase I was assured by the finance agent, Antoinette(no longer works there), that a service plan(CMH brand) was taken out and that I'd be covered from the time I took ownership (which was around 57k kms) till 120k kms.

So it's almost a year and time for me to get my vehicle serviced(75k kms service) and I find out that the extended service plan only starts from 90k kms. This was not what I was advised. Yes my signature is on the form but it's poor service to tell a customer that that is what they signed for and that is the feedback I received when I contacted the dealership.

I challenge you to answer me this why would I purchase a vehicle, take out a service plan and expect to pay for the very next service that is due? What was the point of me taking a service plan if this is the case? The finance agent clearly made a mistake and their is no ownership taken from the dealer.

This is rather poor service and the last time I purchase a vehicle through the CMH brand.

I had contacted the dealer and gave them the chance to do the right thing but they have assured me that this is not their problem and could only apologize for Antoinettes mistake. Regardless if she works there or not, she represented CMH and the dealership should be held accountable for causing me to go out of pocket nw.