Every sale automatically includes a ‘warranty’ according to halacha. The fine print on a warranty would only be to exclude the company from being responsible ‘as per our agreement’.
You said that the succah collapsed, but even without any exclusions the company’s responsibility for replacement could depend on the reason for the collapse.
Did the poles fail to support the weight of the walls and/or the schach? Were they assembled correctly? Or was there an abnormal wind that they might not be accountable for?