A purchased a residential house and lot from XYZ Realty Corporation for PHP 3,600,000.00 under a contract to sell, payable in monthly installments of PHP 60,000.00 over five years. A faithfully paid twenty-eight monthly installments over two years and four months. A then lost her job and was unable to continue paying. Without sending any written or notarized notice to A, XYZ Realty immediately issued a formal letter declaring the contract cancelled and announcing that all amounts paid by A were forfeited as liquidated damages for her breach. A received no refund. A objected, insisting that XYZ Realty had failed to comply with the statutory requirements before it could validly cancel the contract. Is A's objection legally tenable? (Bar 2026 Syllabus)