Poor service

I bought a car from this dealership last year July and it came with an extended service plan. The plan term says 36 months or 45 000 KM which ever happens first. My frustration is that when I took the car I was told that I will take the car for service it's either for 3 years or for 45 000km. I took my car for service at Vereeneging Nissan on Thursday and I was informed that my service plan has expired. I only serviced the car twice. For 45 000 km and 60 000km as the car was a demo. I need an explanation concerning this issues as I am seating with a car that has to be serviced from my own pocket due to someone 's incompetence. I tried calling several times on Thursday but I was told the F & I is on lunch, I left my number for a call from the F & I after her lunch but I guess she is still on lunch. I called the dealership again today and it looks like tge F & I is still on lunch since Thursday. I tried speaking to the manager but apparently the managers are all not at the dealership today. I feel abused as a customer by this company, I have not been treated fairly as a customer. I was given misleading information which is not in line with TCF.