how can i cancel apple care

Covered here in first two paragraphs. There are different options depending on whether or not you are monthly or paid in advance.

https://support.apple.com/en-us/HT202704

Good luck!

Essentially though, after reading through it.

Monthly - you can cancel anytime. Once cancelled you cannot renew. But you can restart a new plan if you're still within the window (often 60 days from purchase).

Paid in full - you can cancel within the first 30 days for a full refund if you haven't used it. If after 30 days then you get a prorated refund.

Hi ruping,

Did that answer your question and were you able to cancel?

Hope it worked out for you!