Whoaahhh, stop.
Your contract is with the contractor, not the manufacturer.
The fact that you paid the cheque to the manufacturer (at the contractor's request) is completely irrelevant.
You have no recourse against the manufacturer, and the manufacturer has no obligation to you, so don't waste your time talking to the manufacturer.
You have paid the contractor for the door.
You made a cheque out, at the contractor's request, to a person nominated by the contractor.
So ... the "consideration" from you has, legally, gone to the benefit of the contractor.
Focus on the contractor.