Consumer Protection (Fair Trading) Act 2003: Primary legislation protecting consumer rights and fair trading practices in Singapore. Governs service contracts and cancellation terms, providing protection against unfair practices.

Electronic Transactions Act: Legislation governing electronic transactions and digital communications, particularly relevant if the service contract was formed electronically or if cancellation notices are to be sent digitally.

Contract Law (Common Law): Fundamental legal framework governing contractual relationships, including notice periods, termination conditions, and contractual obligations and rights under Singapore's common law system.

Unfair Contract Terms Act: Legislation ensuring that cancellation terms and other contractual provisions are reasonable and fair, protecting parties against unreasonable contract terms.

Personal Data Protection Act (PDPA): Legislation governing the handling of personal data, particularly relevant for data handling requirements during and after service cancellation.

Industry-Specific Regulations: Sector-specific regulations that may impose additional requirements for service cancellation in regulated industries such as telecommunications, insurance, or financial services.