What you need to do is contact GoDaddy directly, as we said before.
And there is no need to delete the WordPress.com website to "start over". Just leave it there, as auxclass said.
I asked you a question earlier on...
If the domain name was registered through GoDaddy, what do you want WordPress.com to cancel? The domain mapping from WordPress.com?
...but did not get a clear response, so let me reword it: has WordPress.com charged you for anything? Or did the charges only come from GoDaddy?
If you want WordPress.com to refund you something, please be very clear about what it's about (specify the amount and, if possible, the name of the upgrade). Otherwise, staff has nothing to work with.