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Questions? We’re here to help 

1.888.4ONSTAR (1.888.466.7827
OnStar Member Services 
PO Box 455 
Station A, Windsor, ON N9A 6L7 
OnStar Canada 
OnStar Service Plan Center 
PO Box 8084 STN A 
Toronto ON M5W 3W5 

Commission for Complaints for Telecom-television Services (CCTS): CCTS is an independent agency whose mandate is to resolve complaints of consumers about their telecom and TV services, and complaints of small business customers about their telecom services, free of charge. If you have a complaint about your telephone, wireless, internet or TV service, you must first try to resolve it directly with your service provider. If you have done so and have been unable to reach a satisfactory resolution, CCTS may be able to help you. 
To learn more about CCTS, you may visit its website at or call toll-free at 1-888-221-1687.