Quickbooks accounting with slow or no support

I upgraded from the Quickbooks desktop to Quickbooks online software in March 2020. I requested support in March 2020but my problem wasn't resolved. Lock down happened and again in June I requested support and I was told that somebody would call me to assist as the person I was dealing with at the time could not assist. Up until today, 5 months later, debiting my bank account every month I still can not use my Quickbooks online. I tried calling the *** numerous times, i spend up to 30 minutes listening to all the promises from an auto attendant but nobody actually answers to assist. I need advise on how to cancel my Quickbooks and get a full refund.