Hi @Alison92,
I'm sorry to hear you've had problems setting the correct price for your listing. Just to let you know, this is a forum of hosts, it is not managed by the Airbnb support team. As this is a public forum, I have removed your email address and surname for you own security.
If you have a booking that is for the wrong price you can try and change it - if the guest accepts the change, it will be updated. There is a help guide on this process here.
If you want to cancel a current booking you must cancel it on your bookings and message the guest to let them know why. Make sure you are aware of the cancellation penalties before doing so.
If you do want to take a break from hosting you can either snooze or deactivate your listing - have a look at this help guide for instructions on how to do it.
I hope that is useful!
Kirstie