You got scammed. Cancel your credit card and dispute the charges. Change your email address. Change all passwords. Change any PIN numbers. Anything else financial on your computer? Change that too.
Remove anything they installed with this tool.
Revo Uninstaller
[http://www.revouninstaller.com/revo_uninstaller_free_download.html](http://www.revouninstaller.com/revo_uninstaller_free_download.html)
From Quietman, see: I have been hacked...What should I do?
Next, follow the instructions here even if the pop up is gone.
[http://malwaretips.com/blogs/remove-tech-support-scam-popups/](http://malwaretips.com/blogs/remove-tech-support-scam-popups/)
Also run this tool.
SuperAntiSpyware (Free version)
[http://www.superantispyware.com/](http://www.superantispyware.com/)
And see:
PSA: Tech Support Scams Pop-Ups on the Rise
https://blog.malwarebytes.org/fraud-scam/2014/11/psa-tech-support-scams-pop-ups-on-the-rise/