Early cancelation that doesn't wanna be canceled even after payment

The worst experience I've ever encountered. I am a client for this company and decided that due to many commitments I should close down my account and focus on other commitments. I paid the amount and emailed all documents. No response, I emailed countless times n called the call center and was promised to get a call from the *manager* nothing! Yesterday I called to enquire about my problem and was rudely answered by the consultant. She kept on spelling out the email address like I'm a toddler and when I tell her I can't hear her she responds by saying "I'm helping you here, next thing you'll be calling again saying you didn't get the email address" I didn't appreciate her tone and rude attitude