Thank you for the post and welcome to our community forum!
I understand that you would like to cancel the unauthorized payment dispute. It's best to contact customer services to cancel it.
Click on the words "Help / Contact" at the bottom of PayPal's pages and use the phone option in the blue band at the top OR very bottom of page dependent on what country you are in. Scroll down past the list of help questions and click on 'Call us' bottom of that page. Log in and get the code.
OR
have you considered contacting Customer Service via Twitter?
You can send a Direct Message @AskPayPal on Twitter.
I hope this helps.
Farhana
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