Got charged for free account which I cancelled after 4 days.

these are user-to-user forums. i have no idea what you do on your phone calls.  i was stating what could explain the disconnects. but that was before you made it clear these are accidental disconnects.

if there are obvious phone glitches, re-try contacting support, and at the beginning, ask the support person if there's a way to continue the conversation, in case, there's another disconnect.

or, even better, use chat (which gives you a case number, in case of disconnects):

use a browser that allows popups and cookies and contact adobe support by clicking here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative. ie, double check for an employee badge if contacted in the forums and look for an adobe.com domain in the email address if you click reply to an email. then check again and be very suspicious. any other method of contacting (or offering to contact you) is almost certainly a scam, https://community.adobe.com/t5/using-the-community-discussions/staying-safe-in-the-adobe-support-community/td-p/12919684/redirect_from_archived_page/true.

p.p.s. you can also use twitter to tweet @AdobeCare.