Hi, I'm Elise, a fellow user like yourself and I'd be happy to help with your issue.
Could you try reset the store cache if the cancellation isn't working.
Close the store app.
Press Win + R on the keyboard and type wsreset.exe and press enter.
Then go back into the store and they should have stopped.
Please let me know if you need any further assistance.
Kind Regards,
Elise