We hired a contractor and his team. The company dissolved. We had to hire a new company but the materials used by the first company has not been removed even after contacting him several times. We would like to get rid of it before the winter.
Ideally you can return it to the supplier for a refund. Often you can make returns even without a receipt. Maybe the supplier will pick it up.
However, the best option will depend on what the material is and whether it can be salvaged and put to some other use.
In any even write the prior company advising unless the material is picked up in 5 days it will be deemed abandoned.
At that point sell for salvage, return it, use it or give it away.