If you think you will go to Canada again in the future, you'd better hand it in, or it will affect your future visa, or you will ignore it. Contact whoever informs you of the arrears, and you will be informed of the method if you request to make up. Since it is most convenient for people to pay online when they come back, it depends on whether you have an account there. If not, you can use a credit card, and so can your family. One thing to remind you is to find out when you owe it, and you don't have to make up for the time you spend in China. I guess you didn't inform the insurance company to stop insurance when you left, so you have been on the list.