You can refuse but you could also be sued.
What are the facts and what is your province please?
I purchased 3000 printed books from a company in ontario. I paid a surcharge to rush ship 1000 of them. when the 1000 arrived 250 of them were damaged due to poor packaging and they were a week later than expected. The second shipment of 2000 books was over a month later than promised and I lost over $3000 in revenue due to that.
The amount that I am still owing is only for the rush charges and the shipping, not the actual products - I have paid for the books.
They also misrepresented the fact that the books would be printed offshore, and gave me wrong information that caused a 10 day delay in customs. My business is in BC
It sounds to me that they may owe you money rather than you owing them anything.
If they sue you it will be in Small Claims Court.
You could easily defend and this and could counter-claim at the same time.
You could self-represent and if you find you need some help you can post on this site again and I can assist you
They did replace the damaged books but it took a month to do it. I also asked them about pro-rating the rush charge to the amount of books I actually did receive and they refused.
The amount I owe them is $2000
I feel comfortable refusing if it is just small claims. Thanks