Should I just concede and pay or fight it?

I live in Ontario Canada, I moved out of my previous apartment but did not give the 60 days notice, I gave in my notice on the 9th of the month not the first. Anyway I moved out and now they are taking me to small claims court for the last month I was there. They used my last months rent for the month after I left. I do not believe I should pay for a month when I was not there when they had my last months rent. Should I bother to fight them in court or just make a payment arrangement?