Received A Duplicate Order Exercise Bike, Can't Get Company To Pick Up The Second One, They Are Now Threatening To Charge Us For It. How To Proceed?

Ordered a new exercise bike online. It shipped, and then tracking showed it as delivered in a different city in our region. We contacted the company, they determined the courier had screwed up, and shipped us a replacement bike. Great experience so far.

About six weeks later, a second bike showed up on our doorstep. Courier had figured it out and retrieved the original. We contacted the company and said hey - original bike showed up. It's in a giant box so we can't store it for long (we live in a very small condo) and we don't have a car so we can't get something this big to a store, but we're happy to get it back to you if you can make arrangements. Company seemed thrilled and thanked us for our honesty.

We've now been trying to get the damn thing back to them for more than a month. They sent a courier who wouldn't take it because it needed a label we didn't have. Got the label, another courier came, should have been a new label. We've wasted hours waiting around for the couriers and emailing back and forth with the company.

Finally we let them know that we absolutely cannot store this thing any longer and they need to come get it by (approx 4 day deadline) or we will have to find another home for it. They respond telling us they're going to charge the credit card they have on file from the original purchase for it.

We spoke to the bank who said that since we have clear evidence that we did not order two bikes we should be able to get any charges reversed, but after five weeks of good faith efforts to get the product back to them I'm wondering where we stand legally on our need to get rid of the bike and whether we can give it away. We're in Canada.