Your contract is with the retailer, not with Amtico themselves.
Amtico take great steps to ensure that their retailers have the knowledge and skills to deliver the product and the installation service - and retailers have a store from which they display the product. In turn they will use installers who are either contracted to them with whom they have trust, or are employed directly.
I guess you chose an alternative route to get your installation done?
It is expensive relatively, but one gets what one pays for.