Defective Product; Unsatisfactory Resolution

Purchased car cover from AutoPartsWarehouse which proved defective after first use. Company authorized return and promised refund. Later claimed cover was not defective and offered to repair at my cost. I authorized repair and was charged. Cover was returned unrepaired to a former address 800 miles from my home. Company refused to credit repair charge or refund purchase price. Process took four months to conclude with numerous email and two telephone contacts. I regret not having examined Internet-based complaints for this company before ordering. I am out purchase price, return shipping, and repair cost. Numerous others apparently have had similar experiences.