I have been charged repeatedly for an Apple Music subscription which I don’t want. Can you help me cancel this subscription.

See instructions in How to cancel a subscription from Apple - Apple Support or use an internet browser to cancel as described in How to cancel Apple Music - Apple Support

Also see the following from the second link above:

If you still need help

• If you couldn't cancel your subscription at music.apple.com, cancel your subscription in Settings.
• If you pay for Apple Music with Google Pay, you can cancel your subscription only in the Apple Music app on your Android device or at play.google.com.
• If you still can't cancel your Apple Music subscription, contact Apple Support.