Connection issue

my local site cant connect to demo site.
I intended to purches a new site with ‘client pay option’ 3 weeks ago , and demo site(demo site A) opened,
then I created local site(site A) and made connection between local site(site A) and demo site(demo site A), but client couldn’t complete payment, so the demo site(demo site A) expired.

after the demo site expired, I intended to purches a new site(demo site B) again and tried to made connnection between local site (site A) and (demo site B) but it said ‘the site has already connected’, but actually not(i cant push local site).

please help me.