Eureka Forbes — Without giving filter showing supply

I am doing regular AMC but in March when I called for change of filter they told first you replace your filter by paying money thereafter I will do AmC.
I have done accordingly.
Now when my AMC is going to expired insm asking filter then they denied because which filter I paid on the day of AMC mechanic kept money and shown filter in my AMC.
I request pl don't cheat consumer