How long does a warranty claim stay open for?

I was burning oil back in April this year... I was advised that I need to bring the car back in as soon as it requests oil...

But... That they would only keep the claim open until end of May.

I renewed my warranty in May...

I have burned 1 liter in 2500 miles.

I don't want to pay excess as I think they should honor the consumption test we started.



Has anyone else ever been in a similar situation?



Thanks