Disregard for loyal customers - annual service for a first time owner

I am a first time owner of a vehicle under factory warranty / service plan. My Hyundai Accent (ND 511 365)(2012 model) was purchased 2nd hand from the previous owner, has been taken thrice already (2014, 2015, 2016) for its annual service at Hyundai Springfield, Durban. In December 2016 I noticed a problem with my shocks, and confirmed viz a shock test at superquick, that the rear shocks were poor and should be changed. In January 2017 I gave in my vehicle at Hyundai Springfield Service Dept with this complaint, who: (complaint 1): gave me back my vehicle, stating the shocks were not covered because they were poor from “wear and tear” and not from “mechanical damage” Later the year approximately july 2017, I called in to book my vehicle in for its last annual service under the factory warranty / service plan. I gave my registration details as usual to the service clerk, who picked up on her system that my vehicle was serviced the previous year in june 2016, but agreed to book my car in stating that a 1 month grace period is allowed on annual service. My vehicle was booked for the 3 August 2017. (complaint 2)On my arrival at Hyundai Springfield that morning, I was told that my service plan was expired as of the purchase date of the original owner (11/04/2012). My grievance is that despite : 1. being their loyal customer for the last 3 years 2. having booked my vehicle in with them in january 2017 few months before expiry of the service plan 3. having called them in july to book my car in and them checking on their system,

I was never advised / reminded about the expiry of my car’s service plan/ deadline to have my vehicle serviced. The manager just gave me a “so sorry” that doesn’t help me the least bit. Liquid Capital also has been un-coperative. Please advise what my options are, but 1 thing for sure, Hyundai Springfield, Durban & Hyundai may have well lost me as their future customer.