Republic Act No. 7394 (Consumer Act of the Philippines)
Article 33 — Warranties — Implied Warranty of Merchantable Quality
“Unless otherwise agreed, a warranty that the goods shall be merchantable is implied in a contract for their sale if the seller is a merchant with respect to goods of that kind. Goods to be merchantable must be at least such as: (a) pass without objection in the trade under the contract description; and (b) in the case of fungible goods, are of fair average quality within the description; and (c) are fit for the ordinary purposes for which such goods are used.”
Every sale by a merchant carries an implied warranty that the goods are of merchantable quality and fit for their ordinary purpose. A product that is defective or non-functional upon delivery is in breach of this implied warranty regardless of any 'no returns' policy. You are entitled to a remedy.
Republic Act No. 7394 (Consumer Act of the Philippines)
Article 67 — Prohibited Acts on Product Quality and Safety — Consumer Remedies for Defective Goods
“The consumer may pursue a complaint against the manufacturer or supplier for defective goods through the Department of Trade and Industry (DTI) which has jurisdiction to impose administrative sanctions, order refunds, replacements, and repairs, and impose fines on non-compliant sellers.”
File a complaint with the DTI Consumer Protection Group if the seller refuses to honour your warranty rights. The DTI can mediate, order refunds, and sanction non-compliant businesses. You can file online at the DTI website or at any DTI regional or provincial office.