Unfairly treated- Pay for the repairs

I bought a brand new Nissan QHASHQAI in 2018 and took a maintenance plan with Innovation group. The contract received is written that the car is covered for 10km-90000km or 5 years. No exclusions terms were explained.

On the 22 December 2020 the car had no power and I took it to Nissan only to be told that the Innovation company declined the claim and said they won't pay for repairs due to low mileage . They said they pay for 60000km. They also mentioned that the damage is due to drivers abuse / drivers technic. It doesn't make sense . What did I pay for and why I paid before reaching 60000 ? What the maintenance plan for ?

I have made contact with Innovation group via e-mail and no response was received.

I feel unfairly treated